Alleles are alternate versions of gene(s) that have nucleotide sequences. A. different; completely different B. different; the same C. the same; completely different D. the same; small differences in their E. different; small differences in their

"Alleles are alternate versions of the same gene(s) that have small differences in their nucleotide sequences."

The correct answer is D.

Explanation:

Alleles are responsible for everyone's unique features.

An allele can be defined as the two or more different forms of a gene that can be found in the same specific place of a specific chromosome (this means that each allele has a locus).

The existence of different alleles for a specific gene is a product of mutation.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

d. planting trees

the trees take in carbon to make oxygen.