Why do you call cell membrane as selectively permeable membrane?

The cell membrane is also known as selective permeable membrane because: The cell membrane regular the movement of material in and out of the cell

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explanation: bc blah

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.