She found that thousands of migrating birds depend on a small aquatic animal called brine shrimp as a food source. She is concerned that if the lake continues to get saltier, it may have an effect on the population of brine shrimp and the migrating birds. This introduces the students to a set of experiments on the effect of salinity on the hatching of brine shrimp eggs. Different body tissues and organs are made up of different kinds of cells. The cells in similar tissues and organs in other animals are similar to those in human beings but differ somewhat from cells found in plants.
Cells continually divide to make more cells for growth and repair.
Various organs and tissues function to serve the needs of cells for food, air, and waste removal. The way in which cells function is similar in all living organisms. About two thirds of the weight of cells is accounted for by water, which gives cells many of their properties. In any particular environment, the growth and survival of organisms depend on the physical conditions. Or one organism may scavenge or decompose another.