Anybody can me out?

a is a scientific measurement for a particular unit of energy.

question 3 options:

nugget

portion

calorie

Calorie

Explanation:

calorie is the amount of heat needed at one atmosphere to raise the temperature of one gram of water at 33.8 degrees

think like when you burn calories you're burning energy right?

hope this helps

for the points

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: