All of the following lead to variation except A.
natural selection
B.
mutation
C.
sexual reproduction
D.
speciation

C) Sexual Reproduction

Explanation:

Notice how a, b, and d all have the genes variated.

Natrual selection differintiates the phenotype

Mutation muattes the genes and changes the 'code' of it.

Speciation forms a new species.

So all these would have somewhat of 'changes' persay, so  C would be

the only option left.

C.  sexual reproduction

Explanation:

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

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