1) hiv weakens the immune system by killing a. antibodies. c. t cells. b. b cells. d. killer t cells.

2 ) which of the following statements is false regarding an autoimmune disease?
a.
the body reacts with its own cells and tissues
c.
it can involve cell-mediated responses
b.
its mechanism is well understood
d.
it can involve humoral responses

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian

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.