Because humans do not have fur, goose bumps are not useful in maintaining body temperature. What does the existence of unused structures, such as goose bumps, suggest about the ancestry of humans? A. Humans evolved from chipanzees, who have muscles in their skin that raise their fur when external temperatures fall

B. goose bumps may help humans survive as conditions on earth change

C. humans evolved from an earlier species that likely had fur on hair which was important to the survival of the earlier species

D. Humans in the 18th century needed goose bumps to stay warm ​

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

Ecology can best be described as the study of what

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.