Option one Carbon dioxide
Methane
Nitrogen

Option 2
Cells
Groundwater monitoring station
Methane collection system

answer; i believe that the correct answer is (light);

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

the answer is b.) hydrogen bonds between bases.