Archaeologists have discovered that some Vikings deliberately carved grooves into their teeth; the reasoning behind the decision to make this adjustment to their teeth is unclear.

Archaeologists have discovered that some Vikings deliberately carved grooves into their teeth; consequently, the reasons behind this dental decision remain unclear.

Archaeologists have discovered that some Vikings deliberately carved grooves into their teeth, but the reasons behind this dental decision remain unclear.

Archaeologists have discovered that some Vikings deliberately carved grooves into their teeth; however, the reasons behind this dental decision remain unclear to archaeologists.

Urban environments and metropolitan areas are making gradual advances on natural wildlife habitats, and these gradual advances have negative consequences, because some animals are perishing from habitat loss.

Urban environments and metropolitan areas are making gradual advances on natural wildlife habitats, resulting in negative consequences: some animals are perishing from habitat loss.

Urban environments and metropolitan areas are making gradual advances on natural wildlife habitats; these advances have negative consequences: some animals are perishing from habitat loss.

Urban environments and metropolitan areas are making gradual advances on natural wildlife habitats, and with negative consequences, because some animals are perishing from habitat loss.

Fans were very excited to see the final installment of the Royal Battleground trilogy; in fact, these fans were so excited that they lined up outside the movie theater days in advance.

In order to ensure their viewing ability for the final installment of the Royal Battleground trilogy, hundreds of eager viewers lined up outside the movie theater days in advance.

Fans were so excited to see the final installment of the Royal Battleground trilogy that hundreds of eager viewers lined up outside the movie theater days in advance.

Fans of the Royal Battleground trilogy, excited to see the final installment of it, numbered in the hundreds and lined up outside the movie theater days in advance.

In 1962, Michael Murphy and Dick Price founded the Esalen Institute; the location, in Big Sur, California, was one of the first homes of the Western New Age movement.

In 1962, Michael Murphy and Dick Price founded the Esalen Institute in Big Sur, California, one of the first homes of the Western New Age movement.

In 1962, Michael Murphy and Dick Price founded the Esalen Institute in Big Sur, California; and the location was one of the first homes of the Western New Age movement.

In 1962, Michael Murphy and Dick Price founded the Esalen Institute located in Big Sur, California, it became one of the first homes of the Western New Age movement.

Capitalism is a controversial economic system, because some people are arguing that capitalism rewarding innovation, also rewards hard work, while others believe it encourages greed.

Capitalism is a controversial economic system: some argue that it rewards innovation and hard work, while others believe it encourages greed.

Capitalism is a controversial economic system: the argument that it rewards innovation and hard work has been made by some people, while others believe it encourages greed.

Capitalism is a controversial economic system, because rewarding hard work and innovation is an advantage some people argue for, while others believe it encourages greed.

The catamaran trip to the Channel Islands was Rachelle and Lydia's first trip, and they did not know what to expect, so they were surprised and thrilled to see dolphins leaping out of the water.

The Channel Islands trip was the first catamaran trip Rachelle and Lydia would be taking, so they did not know what to expect, and they were surprised and thrilled to see dolphins leaping out of the water.

Rachelle and Lydia did not know what to expect on their first catamaran trip to the Channel Islands, so they were surprised and thrilled to see dolphins leaping out of the water.

Rachelle and Lydia, on their first catamaran trip to the Channel Islands, did not know what to expect, they were surprised and thrilled to see dolphins leaping out of the water.

Yesterday, I drove to work past the lemon tree; as usual, it was covered with fruit.

Yesterday, I drove to work past the lemon tree; it was, as usually, covered with fruit.

Yesterday, I drove to work past the lemon tree, which was, as usual, being covered with fruit.

Yesterday, I drove to work past the lemon tree, and, as usual, it is covered with fruit.

Their predictive power comes from living close to the ocean floor, where they can pick up the sensitive vibrations of tectonic plate movement.

Their predictive power comes from living close to the ocean floor; that proximity to the sea bottom can pick up the sensitive vibrations of tectonic plate movement.

Their predictive power comes from living close to the ocean floor; oarfish, a close proximity to the sea bottom, can pick up the sensitive vibrations of tectonic plate movement.

Their predictive power comes from living close to the ocean floor, where, because they have such a close proximity to the sea bottom, can pick up the sensitive vibrations of tectonic plate movement.

The Bridge Foundation awarded the Early Childhood Center a grant, and the one condition of the grant was that the Center would be required to report back quarterly with parent and teacher surveys.

The Bridge Foundation awarded the Early Childhood Center a grant, but there was a condition that the Bridge Foundation instated: that the Center would be required to report back quarterly with parent and teacher surveys.

The condition of the grant that the Bridge Foundation awarded the Early Childhood Center was that the Center would be required to report back quarterly with parent and teacher surveys.

The Bridge Foundation awarded the Early Childhood Center a grant on the condition that the Center would be required to report back quarterly with parent and teacher surveys.

Mangroves are the amphibians of the plant world; mangrove plants straddle the land and sea, with roots that extend into salt water and house a variety of wildlife.

Mangroves are the amphibians of the plant world; these amphibious plants straddle the land and sea, with roots that extend into salt water and house a variety of wildlife.

Mangroves are the amphibians of the plant world; they straddle the land and sea, with roots that extend into salt water and house a variety of wildlife.

Mangroves are the amphibians of the plant world, and these plants straddle the land and sea, with roots that extend into salt water and house a variety of wildlife.

Since the 1990s, fishermen in Panama have been clearing mangrove trees, which threaten pygmy sloths, depending on mangroves for their food and habitat.

Since the 1990s, fishermen in Panama have been clearing mangrove trees for firewood and lumber, and clearing those trees for firewood and lumber threatens pygmy sloths that depend on mangroves for their food and habitat.

(Choice C)C

Since the 1990s, fishermen in Panama have been clearing mangrove trees for firewood and lumber, threatening pygmy sloths that depend on mangroves for their food and habitat.

Since the 1990s, fishermen in Panama have been clearing mangrove trees for firewood and lumber, this deforestation threatens pygmy sloths that depend on mangroves for their food and habitat.

Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe, which, in addition, is comprised of a dry, flat grassland that experiences extreme gales.

Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe—a dry, flat grassland that experiences extreme gales.

Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe; the steppe is a dry, flat grassland that experiences extreme gales.

Due to their ability to resist wind, round tents called "yurts" are common living accommodations on the Eurasian steppe a place comprised of a dry, flat grassland that experiences extreme gales.

Paris, often called the "City of Light," buzzes with a special radiance day and night.

Paris, because it's often called the "City of Light," buzzes with a special radiance day and night.

The "City of Light" is what people call Paris, it buzzes with a special radiance day and night.

This is why Paris is often called the "City of Light": Paris buzzes with a special radiance day and night.

Much of ancient Sub-Saharan African art was made of wood, but not Nok artwork: the Nok people in Nigeria made terracotta sculptures featuring human figures.

While much of ancient Sub-Saharan African art was made of wood, the Nok people in Nigeria made terracotta sculptures featuring human figures.

Much of ancient Sub-Saharan African art was made of wood, and the Nok people in Nigeria made terracotta sculptures featuring human figures.

Much of ancient Sub-Saharan African art was indeed made of wood; by contrast, however, the Nok people in Nigeria made terracotta sculptures featuring human figures.

Born with the name Edson Arantes do Nascimento, Pelé was a football player who was born in Brazil; he is regarded as a Brazilian national hero and is the only football player to have won three FIFA World Cups.

Born with the name Edson Arantes do Nascimento, Pelé is regarded as a Brazilian national hero; he is the only football player to have won three FIFA World Cups.

Pelé was originally named Edson Arantes do Nascimento at birth, but he is regarded as a Brazilian national hero and is the only football player to have won three FIFA World Cups.

Pelé regards a Brazilian national hero; he was originally named Edson Arantes do Nascimento, and is the only football player to have won three FIFA World Cups.

Announcing in her physics class, Mrs. Wall announced three keys to success: attending lectures, completing homework assignments, and asking for help.

The three keys to success in her physics class were three items Mrs. Wall announced: attending lectures, completing homework assignments, and asking for help.

Mrs. Wall announced three keys to success in her physics class: attending lectures, completing homework assignments, and asking for help.

Mrs. Wall's physics class heard her announcement of three keys to success in her class: attending lectures, completing homework assignments, and asking for help.

With 38 million residents, Tokyo is the most populous city on Earth.

The most populous city on earth is Tokyo; Tokyo has 38 million residents.

There are 38 million residents in Tokyo, or it is the most populous city on Earth.

Earth's most populous city is Tokyo, it has 38 million residents.

However, sometimes the fragmentary nature of a poem, is something that might seem unfortunate, complements its content.

This might seem unfortunate, but sometimes the fragmentary nature of a poem, despite appearances, its content.

Although this might seem unfortunate, sometimes the fragmentary nature of a poem complements its content.

Although the preservation only of fragments of a poem might seem unfortunate, sometimes this complements its content.

Between 1872 and 1900, mongooses were introduced into most Caribbean islands in order to protect sugar cane fields from pit vipers.

Between 1872 and 1900, mongooses were introduced into most Caribbean islands; they were introduced to protect sugar cane fields from pit vipers.

Between 1872 and 1900, mongooses were introduced into most Caribbean islands and the mongooses were introduced to protect sugar cane fields from pit vipers.

Between 1872 and 1900, mongooses were introduced into most Caribbean islands, their introduction was to protect sugar cane fields from pit vipers.