Part a: which statement best expresses the central idea of the text?

a
dna editing is necessary to return organisms to their native habitats.
b
scientists lack control over how gene editing will affect a species’ behavior.
c
dna editing may save endangered species but poses ethical risks of eliminating others.
d
scientists agree that using dna editing on animals to save endangered species is ethical.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.