Describe a cell which effectively uses diffusion as a means to move materials in and out. suggest how being small cells survive, and being made of many small cells large organisms maintain homeostasis. i don't know of any cells which effectively uses diffusion as a means to move materials in and out.

A cell that uses diffusion for primary material interchange is the Red Blood Cell. Being small increases overall surface area and therefore, more material can be diffused. Also, the cell is able to go into the tiniest of capillaries and still function effectively. Homeostasis is the body's ability to maintain a constant internal environment. By having multiple cells, the various internal variables (blood sugar, sodium level, urea concentration etc.) can by controlled by one type of cell and therefore, because that type of cell only has to worry about 1 variable it can do its job effectively and efficiently

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.