Which of the following is NOT a fossil?

What is it called when an organism blends into its environment?

What is used to estimate a fossil's age from a sedimentary rock?

What is the study of the development of embryos of organisms?

What is used to tell the age of a fossil based on the amount of radioactive element left in the fossil?

What are body parts that are reduced in size with no apparent function called?

What are body parts that are similar in origin and structure?

Homologous structures indicate that two or more species might have what?

Which of the following is NOT a reason that a fossil record may be incomplete?

How is camouflage an adaptation?

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