Two species of spiny mice compete for the same food source. One species of spiny mice feeds on insects during the day, while the second species of spiny mice feed on the same insects at night. This allows both species to survive on the same source of food. This is an example of

Temporal partitioning or niche differentiation

Explanation:

Temporal partitioning refers to the variability in the competitive abilities of different species competing for the same resources based on varying conditions of the environment.

The environmental factors could be light, temperature, moisture, etc. Each species specializes in feeding within varied condition of one or more of the factors.

In this case, both species are in competition but while the first species feeds during the day, the second species feeds during the night. Here, light and temperature probably plays a huge factor.

Temporal partitioning is also known as niche differentiation, segregation, separation or niche partitioning.

the answer is trees if i'm not mistaken

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).