Enzymes and acidic juices in the stomach, which break proteins down into smaller molecules, is know as

Enzymes and acidic juices in the stomach, which break proteins down into smaller molecules, is known as proteolytic enzyme.

Proteolytic enzyme (also known as protease) is any group of enzymes that break down the long chainlike proteins molecules into smaller molecules (peptides) and later into amino acids. In the stomach, protein digestion takes place. The three main proteolytic enzymes; pepsin (produced by the stomach), and trypsin and chymotrypsin (produced by the pancreas) breaks down proteins into polypeptides which are eventually broken down into amino acids by several exopeptidases and dipeptidases.

True.
DDT and its metabolite DDE alter hormones, that affect calcium metabolism and can impact reproduction and development of exposed animals. Birds were major victims of the chemicals' effects. They experience reproductive failure as their eggs lacked sufficient calcium, were extremely thin, and shells broke when sat upon by the nesting adult birds. DDT and its metabolites accumulated to the greatest extent in raptors (that is, carnivorous birds that hunt and kill other animals), birds that eat carrion (that is, dead animals) and fish-eating birds. There were drastic declines in populations of these birds that feed at the tops of food chains. Many carnivorous birds (for example, bald eagles, ospreys, and pelicans) were on the brink of extinction before action was taken at the federal level to ban the use of DDT—and eventually other chlorinated hydrocarbons.