Hello!
Standards of mass are necessary because it is a whole lot easier than using a bunch of different systems. Since the metric system is common, it would be easier to compare something with someone from America and someone from Germany using the metric system as opposed to something otherwise.<span />
Answer: The phenotype is a purple flower color.
Reasoning: If the dominant allele is present in the genotype, dominant traits will be expressed in the phenotype. Organisms that are heterozygous or homozygous dominant for a certain gene will always express that gene. Since this pea plant has the genotype Pp, the dominant allele (purple flower color) will be shown.
A physical change could be the plantet and biosphere have a lot more O2 in the air so more organisms can survive and evolve
