8. Arteries carry oxygenated blood from the heart to the rest of the body, while veins carry deoxygenated blood from the body, back to the heart. Arteries are thick and muscular, while veins aren't as thick, and they have valves.
Answer:
photosynthesis
Explanation:
Plants make sugars in the presence of sunlight in a process called photosynthesis.
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Answer:In the central nervous system, the supporting cells are collectively referred to as neuroglia.
Explanation:In the central nervous system, the supporting cells are collectively referred to as neuroglia.
Answer: (1) photosynthesis occurred
Explanation: The photosynthesis process in cianobacteria changed the composition of earth's atmosphera, rising oxygen levels. This could be possible since photosynthesis used energy from the sun to produce energetic intermediaries to synthesize sugars, and as byproduct due to water photolisis, is oxygen.
