-C4 is the alternative pathway of Calvin cycle (C3 cycle) taking place during the dark phase (light-independent stage) of photosynthesis. In the C4 cycle the first stable compound is 4 carbon compound, namely oxaloacetic acid. Hence it is called C4 cycle. It is a process of carbon dioxide fixation.

-C3 plants have the disadvantage that in hot dry conditions their photosynthetic efficiency suffers because of a process called photorespiration. When the CO2 concentration in the chloroplasts drops below about 50 ppm, the catalyst rubisco that helps to fix carbon begins to fix oxygen instead.

-The problem of photorespiration is overcome in C4 plants by a two-stage strategy that keeps CO2 high and oxygen low in the chloroplast where the Calvin cycle operates.

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Based on what you know about life on Earth what might scientists be most likely to look for on other planets with regard to livi

OverLord2011 [107]

Answer:

Explanation:

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20 POINTS describe the outer core layer of the earth please dont copy from somewhere else

Katen [24]

The outer core of the Earth is a liquid layer and it is mainly made up of the metals iron and nickel.