During osmosis, the semi-permeable membrane is one that:
a. does not allow any particles to pass through.
b. allows only very large particles through.
c. decides what particles to let through based on cell signals.
d. allows only very small particles or water through.

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.