Answer:
<h2>An activated B cell divides into cells that give rise to memory B cells and plasma cells.</h2>
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<span>maintains a constant INTERNAL environment
so other options included internal variable and external environment. but its internal and environment</span>
It is called a gene, so the answer is b. gene
Instead of seeds they produce spores. My names Gary Winthorpe and you can ask me any questions you want ;)