D is correct. Cool air sinks, which forces warm air to rise.
Convection is when warm material rises and cool material sinks
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Answer:
B
Explanation:
because it is I hate health class bit I had to take it hope this helps
Answer:
Cyclins
Explanation:
Cyclins and cyclin-dependent protein kinases (CDKs, cell proteins) also function to control the cell cycle. A group of cyclins: the G1 cyclins, are synthesized during G1 phase and function to activate CDKs which initiate DNA synthesis at the G1/S checkpoint. The cell fails to progress to S phase if there is no sufficient synthesis of G1 cyclins. After a cell passes through this point, the G1 cyclins are degraded, allowing for another group of cyclins: the M cyclins (mitotic cyclins) to be synthesized. M cyclins activate a second group of CDKs which allow the cell to pass the G2/M control point and into mitosis.
Temperature affects a star size and the light it emits and it also affects it luminosity. When a star is cold it usually emits a blue color and when its hot it emits a reddish color. For example, up close to the sun it appears red, this is because the temperature is hot.
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