True or false ?

the total amount of water on earth remains constant because the total amounts of condensation and precipitation balance each other.

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Why do bacteria thrive even in hostile environments

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?