Which best describes a gene?
different allele forms of a trait
tightly coiled strands of dna
the center of a chromosome
a segment of chromosomal dna

I I think the answer is D. The gene is unit that contains the traits from both parent alleles. The gene contains segments of DNA strands which mutates when it undergoes a series of mutation in order to create a a new segments of DNA from both parent genes.

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water