How do cells work together to keep your windpipe clear? Why does your body need more than one kind of cell?

answer; (phospholipid);

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

this would be called the responsiveness

answerclassical conditioning;