Cant tell you the types, but they form from the weather elements, from being compressed, etc
I think the answer is b
so yeah that'll be B' option
hope its help
Two key characteristics of a good scientific investigation are hypothesis and observation of whatever organism your studying.
Answer;
D. The birds have different mating seasons.
Explanation;
-Different species of birds have different mating or breeding seasons. Evolution has played a role in adjusting the timing of avian(birds) breeding seasons to maximize the number of young produced. The breeding season depends on a number of factors, for example In the temperate, subarctic, and arctic zones, the overriding factor is the availability of food. This varies across all different species of birds, irrespective of other similarities they may have.
