Please help? I really need it

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

Easy 6th grade work! 100 points! i need fast! compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city, describe the parts of a cell and their primary function.

Creating new things to solve problems and improve life depends on the close interaction of which two fields?