In what part of the plant are substances transported to where they are needed? A. Roots

B. Stem

C. Leaves

B. Stem.

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B. Stem

Explanation:

In the stem part of the plant are substances transported to where they are needed. So, the option (B) is the correct answer.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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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.