What factors in earth's relationship to the sun make life on earth possible?

The distance from the Sun allows for the right amount of light absorption

The distance from the sun allows for the right intensity of heat.

The gravitational pull of the Sun on the Earth keeps it from straying out into space

answer; the above statement is (true);

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.