According to the theory of ________, mitochondria in cells today are the descendants of aerobic prokaryotes that used oxygen to generate energy.

In natural ecosystems, the presence of predators lessens the effects of ______ among the prey.

Scientists want to determine how closely related chimpanzees are to humans. Which data would give the MOST accurate comparison?

The genetic information in human and chimpanzee DNA shows a high degree of similarity, as humans share about 96-99% of their DNA code with chimpanzees. What is an explanation for this similarity?

A population of bacteria is treated with an antibiotic. Because of variation in the population of bacteria, what is a possible outcome of the treatment?

All bony fish have common ancestors. Their fins develop from similar structures and usually have the same number of bones. Because of this, all bony fish would share _________ structures.

Bees can see yellow, blue and UV light but they can't see red. Bee-pollinated flowers are mostly yellow or blue with UV nectar guides to guide the bees to the food source. Once inside the flower, the bees inadvertently pollinate the plant. This is an example of:

In a population of beetles, there are green and brown colorations that occur with equal frequency. After a forest fire, only 20 beetles remain. 18 of them are green and 2 of them are brown. What describes this change in frequencies?

Scientists estimate that the Earth formed some 4.6 billion years ago with the first forms of life appearing around 3.5 billion years ago. These first forms of life were simple prokaryotes. Later, the first photosynthetic organisms resulted in more ______ in the atmosphere. This allowed for more higher level organisms to appear on Earth.

The foundation for biological evolution or "descent through modification" is...

Before organisms with nuclei evolved, life on earth consisted only of unicellular...

Once cells with nuclei developed, organisms were able to become more complex, which allowed them to adapt to the conditions in more habitats. By which process do organisms adapt and evolve?

Penicillin is an antibiotic that was discovered in 1928. Today, many species of bacteria have acquired resistance to penicillin. This adaptation occurred as the result of...

Flowering plants are also vascular plants. Based on the cladogram, what other members of the kingdom Plantae also have vascular tissue?

According to the Cell Theory, where do cells come from?

According to Darwin's theory of evolution, which organisms are BEST able to survive in nature?

Which type of reproduction is MOST advantageous for the production of a wide variety of organisms in an individual species?

Which statement BEST describes how mutations are related to evolution?

The leopard frog and the pickerel frog are 2 closely related species. In areas where their ranges overlap, the frogs will remain separate species if they --

Hummingbirds have a beak just the right length to reach the nectar in a cardinal flower and as they feed, they touch the pollen structure, transferring pollen from 1 flower to another. This is an example of:

Bats, birds, and even the pterodactyl originally had similar boney forelimbs that, over time, evolved into wings. This is an example of:

Whales, sharks and penguins, all in different classes of animals, have streamlined bodies with fins or flippers for efficient movement in water. This is an example of:

A kit fox lives in the desert and has large ears with greater surface area to prevent overheating. The red fox lives in the forest and has a red coat for camouflage. This is an example of:

The Galapagos tortoises share a common ancestor, but have shells of different shapes and necks of different lengths to reach the food they eat specific to their environment. This is an example of: