Both male and female rats have genotype bb. based on the punnett square, carol concluded that the phenotypic ratio of the monohybrid cross is 2: 1: 1. what mistake did carol make?

The ratio should be 1:2:1. Carol concluded that there are 2 homozygous dominant, 1 heterozygous, and 1 homozygous recessive.
However, it should be 1 homozygous dominant, 2 heterozygous, and 1 homozygous recessive.

The correct answer is C, decomposition. Biogeochemical cycles circulate the nutrients from the soil to the plants, animals, and microorganisms. These organisms die, and their organic matter decomposes, and add back the nitrogen, carbon, and phosphorous back to the pool.