If an organism has a vestigial structures that structure likely once had a function in a

Microorganisms aren’t all decomposers; in fact, many act as producers or primary consumers in an ecosystem. how do microorganisms that act as producers benefit the rest of an ecosystem in terms of energy transfer? what about microorganisms that act as primary consumers?

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?

What class of levers is shown in this image?