The answer is spicules. These
sharp-pointed structures are formed from calcium carbonate skeleton of
the organisms. They can also be formed from silica. They can be big (megascleres),
or microscopic (microscleres). Also dependent on the number of axis on the spicules, they are classified as monoaxon,
triaxon or polyaxon.
Well it couldnt be an animal cell becuase animal cells dont have cell walls. And plant cells have a cell membrane not a plasma membrane so it should be a prokaryotic cell.
Males have XY and females have XX
One reason is for safety! in case you get stranded in a body of water you can keep yourself afloat
Answer:
grass
Explanation:
grass produces the main source of energy for the food chain