The body determines whether certain genes should be expressed or not. Sometimes genes are only turned on once or twice in a lifetime. Which example best illustrates this point?

Complete Question:

The body determines whether certain genes should be expressed or not. Sometimes genes are only turned on once or twice in a lifetime. Which example best illustrates this point?

A. milk-producing hormone after childbirth .

B. insulin after eating .

C. adrenaline when scared or in danger.

Correct Option:

The milk-producing hormone after childbirth  is the example which best illustrates the above given point.

Option: A

Explanation:

The development of mammalian glands occurs during pregnancy. After giving birth to a child the breast begins to grow in size. Just copious milk is generated after delivery, which is typically achieved with the help of milk hormone. Throughout pregnancy, the production of milk is hindered by the estrogen and progesterone that makes its way in the blood stream, which in effect prevents the secretion of prolactin from the pituitary gland, thereby making the mammary glands uncooperative. Thus the hormone for generation of milk after childbirth is not frequent in one's lifetime.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds