PLEASE HELP EARTH SCIENCE QUESTION!!
REEs are not rare at all, so how did they get their name?

The first generation of offspring from the cross of two parents is called the a.f1 generation b.f2 generation c.short generation d.p generation

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

Which of the following explains why a tree is often used as a model to represent the principle of common descent