Select the name of the system to which the following organ belongs. pituitary nervous digestive excretory respiratory endocrine circulatory

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?

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird