In someone who has cystic fibrosis the person’s mucus becomes thick. Figure 2 shows how, in a healthy person, cells at the lung surface move chloride ions into the mucus surrounding the air passages. The movement of chloride ions causes water to pass out of the cells into the mucus.
Explain why.

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?