Compare and contrast helpful and harmful bacteria. Cite examples from the readings to support your comparison. Also cite examples from what you may already know.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts