What processes are involved in gametogenesis?
1) fertilization and zygote development
2) mitosis and production of diploid gametes
3) meiosis and differentiation of gametes
4) crossing over and embryonic development

The correct answer is 2) Meiosis and differentiation of gamets

Explanation:

Gametogenesis  is an important process of development which deals with the division and differentiation of diploid(2n number of chromosome) precursor cell to generate haploid gamets.

             During gametogenesis meiotic division of diploid gametocytes occur to form haploid gamets. The haploid gamets then fuses with each other to form diploid zygote.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.