Because Earth does not get significant inputs of matter from space, its essentially fixed supply of nutrients must continually be recycled to support life.

O False

O True

The response is the basis for vaccination. primary secondary tertiary none of the above

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?