Answer: water
Explanation: Water is everywhere and required to survive, so water would be the most abundant compound.
Answer:the decline of lichens is an important indicator of an imbalance in the ecosystem. this research can help system ecologists predict how pollution will affect the entire ecosystem
Explanation:
For giving you understanding ; we need Free O2 but Oxygen is also available in H20 right why dont we use it !!
As the early atmosphere was reducing as there was no free oxygen but it was later produced by chemoautotrophic bacteria !! Living thing release O2 in atmosphere thus making it oxidising in nature and then life evolves !!
Animals use territorial behavior to adapt to new surroundings. it helps them stay stronger when they have to compete for food and it also helps with overcrowding and overpopulation
Yes but just look it up also can someone answer my question? 10 points