Explain the photos synthesis?

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The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88