Genes act by directing the formation of:

alleles
somatic cells
specific enzymes

answer:

Specific enzymes

Enzymes are responsible for many activities that partake in the cell.

RNA or the ribonucleic acid is very important to the cell because the RNA is the only element that can enable a cell to make use of the instructions in the DNA in the process of producing enzymes which the body needs to function everyday. 

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answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.