Aquatic biomes are characterized by their location their depth amount of rainfall amount of dissolved oxygen

Option A

Explanation:

Aquatic Biome is a natural habitat which is characterized on the basis of physical and chemical characteristics of the habitat, its climatic condition, location and form of life existing in it. There are several types of aquatic biome –

a)Freshwater biome – Water that occurs on the surface of earth and has low concentration of salt and other solids

b)Freshwater wetlands – It’s a land saturated with water generally formed by overflowing of water over any land

c)Marine Biome – Deep ocean and seas

d)Coral reef Biome  

e)Estuarine Biome

Hence, option A is correct

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:

rocks and weathering-matching