Which of the following is a major disruptor of the carbon cycle?
a.
use of chemical fertilizers
b.
volcanic eruptions
c.
acid rain
d.
burning of fossil fuels

Use of chemical fertilizers

The answer is A

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.