A zygote is the product of fertilization. The diploid zygotes of the four organisms seen here all underwent Mitosis and differentiation in order to produce the four very different embryos. In mitosis cell divison occur in which mother cell divide to form two daughter cell . When we talk about the cell differentiation , it is the process in which cell changes from one form to another.
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Point-source pollution is easy to identify. As the name suggests, it comes from a single place. Nonpoint-source pollution is harder to identify and harder to address.
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Explanation: Tube 1 doesn't contain an organism so it can't be that one. Both a snail and a plant are considered an organism, and cellular respiration occurs in almost any organism's cells
