11). There are 30 sugar molecules in the cytoplasm of a plant cell and 40 sugar molecules inside of the mitochondria. Several minutes later, there are 20 sugar molecules in the cytoplasm and now 50 sugar molecules in the mitochondria. The movement of sugar into the mitochondria is best described as: (Assume the mitochondrial membrane contains the same structure as the cell membrane).

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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: