during which process is water produced?
alcohol fermentation
acetyl coa formation
electron transport chain
citric acid cycle

electron transport chain

Explanation:

The electron transport chain includes a series of membrane-embedded proteins that accept electrons from NADH and FADH2. The final electron acceptor in the series is oxygen (O2).  

Reduction of oxygen by electrons from NADH and FADH2 results in the formation of oxidized states of reducing powers (NAD + and FAD+). During the process, oxygen is reduced into a water molecule.  

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: