They are carried out by proteins
Phosphorus is most commonly found in rock formations and ocean sediments as phosphate salts. Phosphate salts that are released from rocks through weathering usually dissolve in soil water and will be absorbed by plants. ... Animals absorb phosphates by eating plants or plant-eating animals.
To have the largest sample size also gives you more data, thus increasing the likelihood of accuracy
D. Phenotype because a phenotype is observable traits
