Answer
cholesterol
Explanation:
Corticosteroids and sex hormones are derived from cholesterol through the same sterodoigenic pathway, with common metabolic intermediate, progesterone, and are under the control of the hypothalamus–pituitary–adrenal gland (HPA) axis (9).
The pulmonary circuit is the path that deoxygenated blood takes, which goes through the heart and to the lungs.
The answer is a gene.
During an embryogenesis, cells divide to form tissues and organs. In some moment, a mutation could occur in a gene in some cell. The copies of those genes molecules will be mutant copies and will be present only in that cell line. That is why pigment is absent only in specific places.
Answer:
Silent Spring seeded important new ideas in the public mind: That spraying chemicals to control insect populations can also kill birds that feed on dead or dying insects. That chemicals travel not only through the environment, but through food chains.
Explanation: