Which of the following is a correct statement about ecosystems. energy and matter flow in one direction only. "energy flows in one direction, matter recycles." matter flows in one direction while energy recycles. energy and matter both recycle repeatedly.

"Energy flows in one direction, matter recycles."

Explanation:

Matter "returns" to the environment by the deutucators. Energy comes from the sun and is transmitted to higher trophic structures.

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 brown mice / white sand dunes