When echinoderms move in a manner such as walking or crawling, they pump sea water through a series of internal body canals. The water is used to inflate some of the tube feet, causing them to expand. In many species, the tube feet are equipped with suc(k)ers that grip onto the sea floor.
Observations is the correct answer.
False, other way around. when oxygen is not present.
Answer:
you answered the question you asked your self lol
A. Combustion
B. Calcium Carbonate
C. Weathering
D. Deforestation
E. Circulation
