Which of the following is an application of the principle of constant proportions? a) Siliceous ooze accumulates on the ocean floor as it is being dissolved because it accumulates siliceous tests faster than seawater can dissolve them. b) Calcium carbonate dissolves at an increasing rate with increasing depth until the calcite compensation depth is reached. c) The concentration of a single major constituent can be measured to determine the total salinity of a water sample. d) Increasing pressure increases the number of water molecules in a given volume and inhibits the number of ice crystals.

c) The concentration of a single major constituent can be measured to determine the total salinity of a water sample.

Explanation: The law of constant proportions is also known as Proust’s law or as the law of definite proportions. It states that chemical compounds are consists of elements that are present in a fixed ratio by mass.

No matter how much the salinity increases or decreases in the ocean, the number of ions proportional to each other remains constant.

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:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.