Answer:
a. It can be used for photosynthesis.
Explanation:
Since carbon dioxide is needed in the photosynthesis process, then much of the carbon dioxide which is produced by green plants is not always excreted in form of metabolic waste because it can be easily used in the photosynthesis process.
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The liver stores a multitude of substances, including glucose, vitamin A, vitamin D<span />, vitamin B12,vitamin K, iron, and copper.
The best answer for the blood vessels' valves would be these are veins that would then help in preventing the back flow of blood because the walls have small muscle to pump the blood back to the heart.Hope this is the answer.
Most respiratory illnesses are spread primarily through contact, droplets, or through the air.
