Its the letter B because its the circulatory system
ungus and mold do not provide their own nutrients so they must feed off of various food sources. They absorb the nutrients and break down the food. As this happen the hyphae is able to add new cells and grow upward as well as branching out like a tree.
please mark as BRAINLIEST
thank you
I'd say agriculture, though in more recent years you could argue for mining.
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<span>B) Thymidine is only being added where the DNA strands are furthest apart. </span>