1. A
2. E
3. C
4. B
5. F
6. G
7. D
A membrane that allows only some materials to move in and out of the cell is B. Semipermeable.
Pretty sure the answer is B as erosion happens from weather or rain
They must occur in the DNA, which is in each cells nucleus. More specifically the nucleolus of the cell. A mutation occurs in an allele, where a base triplet (or a codon) gets transcribed incorrectly.
