The purpose of Mendel's experiments with dihybrid crosses was to determine whether:
A. pea plants produce haploid cells or diploid cells.
B. two recessive traits could be passed to offspring.
C. two traits affect the inheritance of each other.
D. pea plants had traits with more than two alleles.

thinking it would be physical characteristics

it is because according to the process , scientific inquiry is a process with many steps because each step occurs to the scientist and if you just skip a step there would be no steps to scientific inquiry.

answer( increase) their individual contractile activity;