5) why can the cutting down of trees be damaging to the environment?
a) trees bring about global warming.
b) trees absorb carbon dioxide and give out oxygen.
c) cutting trees has no effect on the environment.
d) trees bring shade and protect humans from sunburn.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.