- Which element is directly linked with the growth of a plant?

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HELP!! What are some examples of machines that use counter-current heat exchange? Find a basis for R(T) when T : R3 -> R3 , T( a1,a2,a3) = (a1-2 a2 , a2+a3 , 2 a1+a2+5 a3)? Please help with hard precalculus? How many grams of CO(g) are there in 88.5 mL of the gas at 0.711 atm and 30 ∘C? Calculate the energy in joules of a photon of red light that has a frequency of 4.0x10^14 hz?