Which of the following do complex organisms use to regenerate body parts?

Organisms regenerate in different ways. Plants and some sea creatures, such as jellyfish, can replace missing parts by extensively remodeling their remaining tissues. Some animals such as lobsters, catfish, and lizards replace missing parts by first growing a specialized bud of cells, called a blastema.

Explanation:

Based on regenerating ability, there are three types of cells : Labile cells — cells that routinely divide and replace cells that have a limited lifespan (for example, skin epithelial cells , and hematopoietic stem cells ).

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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.