Why is earth’s atmosphere rich in oxygen and poor in carbon dioxide, whereas the reverse is true on venus? what would happen to earth’s oceans if earth were a little bit closer to the sun?

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?

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil