Which of the following is an example of asexual reproduction?

A. a fish releases sperm, which unites with an egg of another fish.
B. a worm is split in two; each half grows back into a complete worm.
C. a gray cat is the offspring of a black cat and a white cat.
D. flowers from two different plants are mated to produce a seed.

b)a gray cat is the offspring of a black cat and a white cat.

Explanation:

We can eliminate a because sperm is used in sexual reproduction, c is an example of a cat inheriting a trait from it's parents which would be sexual reproduction, and d is 2 plants mating which is also sexual reproduction which only leaves you with b)a gray cat is the offspring of a black cat and a white cat.

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.