Describe the four sources of evidence for evolution upon which Darwin based his ideas in common descent.

- Fossil record

- Geography

- Embryology

- Comparative anatomy

Explanation:

The four types of evidence for evolution upon which Darwin based his ideas were:

1-The geographic distribution of related species. The theory of evolution states that species evolve in geographic areas that were colonized by their ancestors.

2-The fossil record shows successions of organisms through time

3-Embryology: animal embryos in related species are very similar in the early stages of development but differentiate as they grow, thereby suggesting these species evolved from a common ancestor.

4-Comparative anatomy demonstrates physical and structural similarities between species. The species share anatomical similarities because they descend from a common ancestor (i.e., presence of homologies).

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

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).