Which is true about what models allow us to do to the system being studied? A) Models are more accurate. B) Models are more waste of natural resources. C) Models require more scientists to study a system. D) Models allow many systems to be studied more than before there were models

answer; ///(b) it is composed of four protein chains and four heme groups;

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 answer is d.) homologous; have mammary glands

it's c.us forest service