I am pretty sure number 4 is your answer
The answer is C as isotopes are elements with same proton but different number of neutrons
Answer:
2) End Triassic
Explanation:
End Triassic extinction occurred 201 million years ago. It was caused by the rifting of super continent Pangea. Pangea started to break and drift apart. When North america started to separate from Africa, volcanic activity increased. Lava and a large amount of gas was released into the atmosphere specially carbon dioxide. This led to global warming like condition which ultimately caused extinction of a large number of species.
Answer:
The answer is A.
Explanation:
Because B is easily disproven because they do not always spend their whole life on land. C is incorrect because most species of birds to not spend their lives in water. And D is wrong because both of their young develop in eggs.
I believe the answer is c