A characteristic that helps and organism survive and reproduce in its environment. A characteristic that improves an individual’s ability to survive and reproduce in a particular environment

A group of organisms that are closely related and can mate to produce fertile offspring

A sketch that includes all known organisms

The process in which populations gradually change over time. The process in which inherited characteristics within a population change over new generations such that new species sometimes arise

A human’s arm, a cat’s front leg, a dolphin’s front flipper, and a bat’s wing

In older layers of the Earth, are fossils more or less likely to resemble today’s animals or plants?

What are two signs that different species may have a common ancestor?

How does an adaptation help an organism?

the sequence of life’s history as indicated by fossils

Which of the following is NOT evidence that whales evolved from mammals that once lived on land?

Where do scientists look for evidence of evolution?

What is a fossil?

The fossil record provides evidence about

All living things inherit similar traits from their

If you compared two kinds of living organisms, what might you learn about their history?

What makes the human hand similar to a dolphin’s flipper or a bat’s wing?

What does the similarity between humans, dolphins, cats, and bats indicate?

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