What is the hole in the center of the iris? what is its function?

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?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?