Which of the organisms that one studied could've been produced from a single parent

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.

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

sex cells are usually half's then they find another half and make a fertilize egg