No; some mice may have developed lung cancer in less than 500 days of cigarette smoke exposure.
Answer:
C. Because your body cannot accurately sense when your muscles are done working hard.
Explanation:
When Charles Darwin stepped ashore on the Galapagos Islands in September 1835, it was the start of five weeks that would change the world of science, although he did not know it at the time. Among other finds, he observed and collected the variety of small birds that inhabited the islands, but he did not realize their significance, and failed to keep good records of his specimens and where they were collected.
Leptin is a chemical messenger which is secreted by fat cells that act as an appetite suppressant.
Leptin is a hormone of energy expenditure. It is made of adipose cells and helps to regulate energy balance by way of inhibiting hunger.
Both hormones they act as receptors in the arcuate nucleus of the hypothalamus. When someone is obesity, the sensitivity to leptin decreases.
