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Answer:
A heat source is anything that can heat up a spacecraft. Heat sources can be external (from outside the spacecraft) or internal (from inside the spacecraft)
Blood has three main functions: transport, protection and regulation. Blood transports the following substances: Gases, namely oxygen (O2) and carbon dioxide (CO2), between the lungs and rest of the body. Nutrients from the digestive tract and storage sites to the rest of the body.
Capillaries are the smallest blood vessels in your body. Oxygen passes through the walls of your capillaries to your tissues. Carbon dioxide can also move into your capillaries from the tissue before entering your veins
Explanation:
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Answer:
Define:
1. Acid: Substance with particular chemical properties including turning litmus red, neutralising alkalis, and dissolving some metals; typically a corrosive or sour-tasting liquid of this kind.
2. Respiration: The act of process of breathing: the inhaling of oxygen and the exhaling of carbon dioxide.