PLEASE ANSWER QUICKLY Which characteristic is shared by all mollusks and echinoderms?

live only in salt water

lack a backbone

use tube feet to move

have an open circulatory system

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?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Where in the cell are ribosomes made?