Which of your fossils are most likely heterotrophs? Which of them are autotrophs? How do you know? Fossil A is a snail, fossil B is a fern, fossil C is a trilobite, and fossil D is a brachiopod.

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Can someone i have no idea of how to do this.

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?