Answer:
Answer is A. Increases in brain size are primarily due to myelination and increases in the number and size of nerve endings.
Explanation:
Myelination is the process which leads to the formation of myelin sheath around axon or nerve impulse.
The myelin formed is a coating rich in fat, that is found around the axon of neuron. It protects the neuron, and at the same time helps the neuron to conduct signals or impulses move quickly and efficiently.
Do you mean by-product? Because in that case no. Oxygen is not a by-product of the Krebs Cycle, but Carbon Dioxide is.
The answer is a. The arteries are red and transfer blood to the heart. Veins are blue and transfer blood away from the heart and to all of the different parts of the body. The capillaries are in-between the veins and arteries and provide blood to cells.
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