Answer:
Red Blood Cell
Explanation:
Red Blood Cells (RBCs) are round and without a nucleus. It has no nucleus so that it has more space to accommodate oxygen molecules and it helps in diffusion due to the biconcave shape, and that biconcave shape is present because there is no nucleus present in the RBC.
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<span>This includes about 3,000 species in North America. Biologists and naturalists believe that there are many more species of spiders still to be identified and named. The 35,000 species of spiders in the Order Araneae are grouped into three sub-orders and seventy different families.</span>
Answer:
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Explanation:
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Associative learning is the event may be two stimuli or a response and its consequences
Well for internal <span>they have proteins that respond to events inside the cell which are called internal regulators! They allow the cell cycle to move on only when certain processes have happened inside the cell internally. The opposite for external and it means p</span><span>roteins that respond to events outside the cell are called </span>external regulators<span>.
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