The work of Charles Darwin and Alfred Wallace on the origin of the Earth's species extended the ideas of Lyell's uniformitarianism into the biological sciences. The theory of evolution is based on the principle that the diversity seen in the Earth's species can be explained by the A) random variation in the genetics of any population. B) idea that in any population, too many individuals are produced. C) uniform modification of genetic traits over long periods of time. D) sudden change in the gene pool due to mutations within the DNA of a given population.

Explanation:

C) uniform modification of genetic traits over long periods of time.

The theory of uniformitarianism  states that the natural phenomena and laws that are bringing about changes in the today's world are functioning in the same rate since the geological times. This idea of uniformitarianism was linked to biological sciences because according to Darwin and Wallace's observation, the uniform modification of genes among the population brought about the species diversity on the Earth.

well

explanation:

you know they are heterozygous for a trait because they have it as jj or jj.