Answer: As each cell differentiates, the <em>DNA </em>changes so that each type of cell has different <em>DNA</em> once it reaches maturity. Mutations in the cells’ nuclei lead to new combinations of <em>DNA</em>, resulting in different shapes and functions in the different types of cells.
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This might refer to the phosphorus cycle.
Phosphorus cycle is a biogeochemical cycle that observes how phosphorus move through minerals, soil, water, and organisms. Typically, plants absorb phosphorus from the soil. And animals get phosphorus from the eaten plants. When these organisms dies, they decay and the phosphorus returns to the soil and inorganic matter.
I would say B. A hockey puck sliding across the table
