HELP ME PLEASE HELP ME PLEASE I DONT UNDERSTAND Why are models, such as a model of DNA, important to use in studying science?

A None of these

B Models help scientists understand concepts and processes

C Both of these

D Things may be too big or too small to measure or use practically

option  B

Explanation:

Because scientist wants to how a child is similar some what to its parent .HOW it get same feathers as its parent?

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

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.