Which of these is the smallest unit that natural selection can change?

a) a speciesê¹ gene frequency
b) a populationê¹s gene frequency
c) an individualê¹s genome
d) an individualê¹s genotype
e) an individualê¹s phenotype

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

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.

i think the answer would be d

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%