If a fat source is counted towards an individual's discretionary calories, what does this mean?
a. this fat source should account for 30% of the daily fat intake.
b. this fat source supplies essential fatty acids.
c. this fat source can be consumed in great quantity with no adverse health effects.
d. this fat source is high in saturated fat and its intake should be limited.
e. this fat source should be a consistent part of a person's diet.

d

Explanation:

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:

b. heterotroph

explanation: