The correct answer is "leptin".
Leptin is a hormone secreted by adipose tissue to signal satiety. This hormone works on the arcuate nucleus of the hypothalamus where the satiety center is located. Another hormone, ghrelin, works to signal hunger and also works on the arcuate nucleus of the hypothalamus.
Answer: D. Two distantly related species both live in hot, dry deserts.
Explanation: Don't worry it's right. I know that for a fact because I just took the test.
Answer:
Bones. They are vertabrates, which means they have a backbone
Explanation:
Fish, reptiles, amphibians, birds and mammals all have bones
So a change in an organism's DNA can cause changes in all aspects of its life.Mutations<span> are essential to </span>evolution<span>; they are the raw material of genetic variation. Without </span>mutation<span>, </span>evolution<span> could not occur.</span>
Oxygen is an element in the sixth group of the periodic table. This means it contains 6 electrons in its valence shell. Therefore, to complete its octet, it will prefer to gain two electrons rather than to donate 6. This is why its valency is -2. The relatively easy to achieve octet makes Oxygen a reactive element.
