D. Connective tissue cells. Loose connective tissue contains a variety of cell types. Those that will be considered in this lecture include: (1) endothelial cells, (2) pericytes, (3) fibroblasts, (4) macrophages, (5) plasma cells, (6) mast cells, and (7) fat cells.
niche noun [ C ] (POSITION) âº a job or position that is very suitable for someone, especially one that they like: He has carved/made a niche for himself as a financial advisor. âº an area or position that is exactly suitable for a small group of the same type: an ecological niche.
A habitat is expected to have relatively unvarying characteristics (temp, rainfall, etc), and if these change significantly it is likely that the organism will either go extinct in that habitat or adapt to the changes. A niche is a specific role played by an organism within its habitat. It is defined by how an organism interacts with its environment. (e.g. the Turkey Vulture occupies the niche of scavenger in the Mojave Desert, whereas in a similar habitat in South America, the Andean Condor occupies that niche.)