Which evidence supports the big bang theory? Select three options,
Many galaxies exist.
Planetesimals form in debris disks.
Most galaxies are moving away from us.
Uniform background radiation is detected in every direction
Galaxies spin faster than they should based on visible matter.

Explanation:

The big bang is a physical theory that explains how the universe we know came into being. This theory states that the universe was generated from a particle that has expanded and continues to expand today. all this expansion allows several galaxies to be scattered throughout space, in addition to allowing these galaxies to move away from each other.

The Big Bang theory also states that atomic nuclei existed at the beginning of the universe and that these nuclei must have left a trace of their existence as a detectable range of radiation. This can be proven by stating that uniform background radiation is detected in all directions.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

i think its the first one