4. Many fresh-water one-celled organisms have structures called contractile vacuoles. These structures collect and pump out excess water that accumulates in the cell. Name the process that
causes water to flow into these organisms.
Explain why contractile
vacuoles would be of little value to one-celled organisms living in the ocean (salt water).
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Define dew point. i am writing this part to be able to ask the question

Aliquid solution can be made select all that apply. dissolving solids into liquids, mixing liquids, dissolving gas solutes into liquids , mixing gases, mixing solids

15) a substance used in manufacturing gasoline consists of finely divided platinum supported on an inert solid. suppose that the platinum is formed by the high temperature reaction between platinum (iv) oxide and hydrogen gas. the other product is water. a) write and balance the equation b) how many grams of hydrogen are needed to produce 1.0 g of platinum metal? c) how many moles of water are produced at the same time? how many grams? ( show work, .)