Cyanobacteria are thought to have introduced oxygen into the early atmosphere. this was important because oxygen played a key role in

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?

Two critical interventions to turn around the opioid crises are:

Approximately what portion of the foods that we eat have been genetically modified in some way? a. fewer than 10% b. about 50% c. nearly 100%