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12-because in summer we need more water according to our body need to make sweat to keep our body cool so in summer our urine is more concentrated
13-no, it is not true
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12.
Dark yellow urine indicates concentrated urine and the excretion of waste products in a smaller quantity of water. During summer we sweat more in order to maintain our body temperature. So more water is lost from our body.
13.
A fish's heart pump only deoxygenated blood because the fish heart is a two-chambered heart with an atrium and ventricle. The heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to other body parts from where deoxygenated blood is returned to the heart.
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