As PCBs move up the trophic level in food chains, of food web, their concentration increases. What is that called?

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only

Explain why the plants cortex would serve as the best food source for animals