Plant cells have what is perhaps the most complex outer coverings. Plant cell walls are made largely of cellulose which forms strong, highly rigid, almost indigestible coverings that protect the cell and gives it shape.
<span><span>A plant that, when self-fertilized, only produces offspring with the same traits.</span></span>
Some examples of important nonliving things in an ecosystem are sunlight, temperature, water, air, wind, rocks, and soil. Living things grow, change, produce waste, reproduce, and die.
Gamete Cells. Eggs and sperm are reproductive cells and reproductive cells are called gametes.
