Answer:
D.Each chromosome consists of a single long DNA molecule, and each gene on the chromosome is a particular segment of that DNA.
Explanation:
A closed DNA molecule contains two strands of linear nucleotide sequences, and both DNA strands contain genes. These genes are DNA sequences that may be transcribed in messenger RNAs (mRNAs).
The cell nucleus contains chromosomes in which the double-stranded DNA molecules are packaged by specialized proteins (histones). Moreover, there are organelles (mitochondria and chloroplast) that also contain genes which are transcribed in an analog mode to genes contained in the nuclear chromosomes.
The hunter gatherer are wandering food collectors.
The hunter gatherer affected their environment by setting fire to prairies. They do this in order to have open fields that will be convenient for their hunting activities. Hunter gatherer brought about extinction of many big animals due to over hunting.