What does a gated channel in a cell membrane allow

What process allows for the development of haploid sex cells? mitosis meiosis fertilization pollination

What pattern of migration do whales follow?

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass