Answer:
most of them require food and oxygen
Explanation:
the plants take the food from the underground and the animals take there food not from the underground but they still eat, so the need food. the oxygen ist normally, when you put plants in a place where is no oxygen they will die, the animals need oxygen too. If you put an animal in a room/place where is no oxygen they will die
The squirrels are attuned in their brains to understand that owls are a threat because it is a predator. This is visual stimuli that evolved over many years to elicit a conditioned response. This is an innate behavior (meaning that it has been pre-programmed into an animal's genes) and offspring are naturally born with it.
The other events that most likely occurred during the same time period would be; An environmental change that did not favor the individuals in the population with the allele most likely led to the change in allele frequency; because the allele frequency decreased by so much, there would had to have been a decrease in the population within a three generation period of time.
The natural streaming is called osmosis
