The hydrosphere makes up all of earths water, and has a secondary sphere called the cryosphere which encompasses all of Earth’s ice. This is important for all living things. Aquatic life lives in water, and land animals drink it to survive.
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Strenuous muscular is just a fancy way to say exercise. As the muscles are used more often the need more oxygen, so that is why your breathing rate increases while doing "exercise".
Answer:to scare off a predator
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Photosystems are structural and functional
units of protein complexes that are involved in photosynthesis and carry out the absorption of light and transfer of electrons and energy. The reaction centers of photosystems are made up of structurally different pigments which enables plants absorb light energy at different wavelengths.
