Unicellular organisms excrete waste by a contractile vacuole. A vacuole is membrane-enveloped organelle in a cell that is found in lots of microorganism. It expands, filling with water then contracts, removing all of its contents to the exterior of the cell.
Water is the most abundant molecule in the Earth’s atmosphere is false.
Answer: the earth was just starting to develop really well and well enough for life.
Explanation: atmospheric oxygen and oceanic calcium levels went up, but nobody needs to know that much facts about how earth developed, But the group called phyla started growing because of these conditions
Commensalism. the symbiont benefits and the host is unharmed.
"the process of hypothesis and testing through which scientific inquiry occurs"
