When Mendel crossed hybrid pea plants, he observed that certain traits would appear in the next generation more often than others. He also observed that traits did not show up in offspring in predictable combinations. For example, not all tall plants had green peas, while not all short plants had yellow peas. Which term describes this observation?

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.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

the answer would be d : p