What is a tough and rigid layer that surrounds plant cells as well as some algal bacterial cells

What do animals wth echolocation have in common other than echolocation

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Glucose is broken down in different ways, both in the presence and in the absence of oxygen. using the table for reference, what major products are formed in each reaction set?