The biological evolution of the species on Earth started with the inorganic molecules which reacted with somehow the changes in environment forming the right conditions for life to flourish.
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Answer:
No, viruses are not considered cells as they're parasitic and can't live on their own. A virus has to infect living cells in order to survive, so it's not considered a cell.
I'm not entirely sure why holistic treatments would be controversial in
animals. Perhaps what makes them controversial is the fact that we tend
to assume we know what makes them holistic and how they will be holistic
for the animal - this isn't necessarily the case, as we can only make a
good guess about it.
Answer:
In the given case, the upsurge in the size of the squirrel population would have taken place due to genetic variation and more availability of food. Genetic variation plays the most important role in the process of natural selection and is the basic mechanism of evolutionary change. Genetic variation refers to the variation in DNA between the individuals.
Thus, it can be said that in the given case, the amount of food, which was less in the past may have got increased, and the squirrels of the coming generations would have demonstrated higher levels of genetic variation than shown by the previous generations. Thus, the number of squirrels got increased in the population.