Distinguish between a trace element and an essential element. give an example of each.

Trace element are needed only in small amounts and the plant do not ‘ die’ when they lack.

                                               While insufficient supply of an essential element can lead to major diseases and inhibit  main function of the plant and can ultimately kill the plant  

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide