It should be 3! That is the only logical answer to the question...
Dinosaurs became common on land
I'm guessing its so they can be able to diagnose a patient and see whether they need treatment or not
Answer:
B. It shows how organisms change over time.
Explanation:
embryos can not be observed in fossils.
Proteins are degraded so thats why they can not be studied.
Organisms can not be evolved instantly.
