Xavier used a chart to list the roles of two different molecules in protein production
Protein Production
Y
brings amino acids for the
ribosome to link together
stores the information for
protein synthesis
Which headings best complete the chart?
OY: DNA
Z: tRNA
OY: TRNA
Z: DNA
OY: mRNA
Z: tRNA
O Y: tRNA
Z: mRNA
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the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

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answer; /// the shaft of the hair consists of dead cells;