In the chemical equation fes + 2hcl > fecl2 + h2s, there are two fecl2 molecules.
select the best answer from the choices provided
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Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?