Some of Darwin's most important observation occurred in which group of islands off the coast of Ecuador?

What British naturalist sent Charles Darwin an essay with similar ideas about evolution through natural selection?

Traces or remains of ancient creatures are called ___________ .

The gradual change in a species over time is called __________ .

The British naval ship on which Darwin sailed for nearly five years was the _________________.

Which of the following is the term for a group of similar organisms that can mate and produce fertile offspring?

Which Galapagos Island species is pictured?

The marine iguana's long, flattened, fin-like tail makes it a strong swimmer able to reach underwater algae. This tail structure is an example of a(n) _____________ .

The process by which individuals that are better adapted to their environment are more likely to survive and reproduce is called ___________ .

The process of selecting organisms with desired traits to serve as parents of the next generation is called __________ .

Which large, flightless South American bird is shown? Darwin discovered a new species that is now named after him.

What did Darwin realize about the giant tortoises of the Galapagos?

Darwin found that the beaks of ____________ were adapted to the type of food available on the island on which each lived.

Which Galapagos Island species is shown?

Shamrock spiders have abdomens that show a wide range of colors including red, yellow, white, and pale greenish. This coloration is an example of ____________________.

The blue jays in the picture are in a struggle for food (a limited resource). This is an example of ______________ .

Female black widows can produce several egg sacs during the summer, each one containing around 200 eggs. This is an example of __________________ .

Which unexpected resident of the equatorial Galápagos Islands is pictured?

In his book, The Origin of Species, Darwin proposed that evolution occurs through the process of ______________ .

Which of the following were creatures Darwin observed on the Galápagos Islands? (multiple answers possible)

What was Charles Darwin's job aboard the HMS Beagle?

In Argentina, Darwin found fossils of the bony armored covering of Glyptodon, believed to be an ancestor of modern ____________ .

Which of the following are traits of the mainland South American iguana? (multiple answers possible)

The Galápagos finches are well-known for differences in the shape and function of their __________ .

What is the name for the process through which the organisms best adapted to their environment survive and live to reproduce?

Any difference between members of the same species is called _______________ .

During the five-year voyage of the Beagle, Darwin visited the island of Mauritius, which had been the home of the _____ (last observed in 1662).

Darwin saw that through ____________ humans had created different breeds of sheep with diverse traits.

Turtles lay many eggs. Not all of the young will survive. This is an example of _________ .

Female American house spiders can produce egg sacs with as many as ___________ eggs inside.

In South America, Darwin found fossils of sloths that were _____________ .

Charles Darwin reasoned that plants and animals that arrived ___________ faced conditions that were different from those on the mainland.

Darwin thought that a process similar to ___________ might happen in nature to produce change in species.

The primary purpose of the HMS Beagle's 1831-1836 voyage was ____________ .

Darwin noticed that the ____________ (pictured) from different islands of the Galapagos, had differences in their feather color, beak shape, and eye color.

Any of the differences between members of the this wildebeest herd are ____________ .

Darwin referred to the pictured creature as a ____________ .

Alfred Russel Wallace was __________ . (multiple answers possible)

Since food and other resources are limited, members of a species must ___________ each other to survive.

Most monkey flowers cannot grow in soil that has a high concentration of ___________ .

The vegetarian finch of the Galapagos has a strong, parrot-like beak for crushing tough buds and leaves found in its habit. This is a(n) ___________ .