I think the answer should be B. is the correct answer. In transcription, a segment of one strand of double stranded DNA.
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There are about 950,000 species of insects known but estimates range as high as 2-10 million which means that there are probably many species not yet known which have probably gone undetected so far in perhaps more remote parts of the world.
Answer:
A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.
Explanation:
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The central nervous system includes the brain and spinal cord.
