Which of the following categories contains the most species?
order
genus
class
phylum

The correct answer will be option-Phylum.

Explanation:

The organisms are classified according to the classical system of classification proposed by the Carolus Linnaeus in 1735. This system of classification arranged the organisms into seven hierarchical orders of taxon arranged from the most inclusive group at the top of the hierarchy to the least inclusive group at the bottom in the hierarchy.

The most inclusive group is Kingdom followed by phylum, class, order, family, genus and species when arranged in the descending order. Among the given options- phylum is the most inclusive group which contains most species as compared to another taxon.

Thus, the phylum is the correct answer.

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:

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )