Ventilation systems are needed in a <span>multicellular organism to actually obtain oxygen and give out carbon dioxide. Without this ventilation system, it would be very difficult for multicellular organisms to survive. It has been also observed that surface diffusion is not enough for a multicellular organism to breath.</span>
Answer:
Compost
Explanation:
Compost is rich in organic nutrients
Answer:
you can find the volume of an irregular object by immersing it in water in a beaker (or other container) with volume marks and see how much the level goes up.
Explanation:
B. He found similar fossils on different continents that are separated by oceans.
