Asixth grade science teacher asks the students to explain the role of cilia in the lower respiratory tract. which student response is the best?
a. cilia to warm the airways so that moisture in the air can neutralize any germs that get in our lungs.
b. cilia facilitate a chemical defense against germs by secreting an enzyme that will cement the germ to the lining of the airways.
c. these little hairs move germs trapped in mucous toward the throat so the body can cough them out.
d. cilia can trap the microbes in one location so the body can grow scar tissue around them and wall them off so they can't cause disease.

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

Australopithecus robustus was likely the longest-surviving species of australopithecine in south africa. it had: a. large molars, a big face, and a sagittal crest. b. a large body, large teeth, and a sagittal crest. c. a big brain, big teeth, and a big face. d. a big face, large teeth, and a large body

The primary organisms involved in the process bacteria and fungi.