Mitosis is when a DNA error, aka mutation, occurs in a body cell. When cells divide, it needs a copy of the DNA. During DNA replication, that error can cause the instructions for building proteins to differ. The change can not affect offspring. Meiosis is the same situation, but in sex cells. This can be transferred to offspring.
The cell membrane allows substances to enter and leave the cell and gives the cell structure.
Answer: A. Family size
Explanation:
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Cartilaginous fish do not contain any bones - their skeleton is made up of cartilage.
Jobs. Like a snow blowing company. They would not have that in Puerto Rico. But Canada might. Because they have a different enviornment.