<span>Way #1: ax - bx - ay + by = a(x-y) - b(x-y) = (a-b)(x-y)
</span>Way #2: <span>ax - bx - ay + by = x(a-b) - y(a-b) = (x-y)(a-b)</span>
<span>A sperm cell is produced by spermatogenesis. </span>In order for the sperm cell to achieve a diploid state, the sperm cell must fertilize an egg.
You can use a natural history book field guides or biological keys if they are difficult to identify
For primary succession to occur, there must be a pioneer species or dirt/soil.
Over hundreds of years these “pioneer species” convert the rock into soil that can support simple plants such as grasses. These grasses further modify the soil, which is then colonized by other types of plants. Each successive stage modifies the habitat by altering the amount of shade and the composition of the soil. The final stage of succession is a climax community, which is a very stable stage that can endure for hundreds of years.
Animal cell do not have cell walls
