Tubifex worms contain haemoglobin. Some other species of worms do not contain haemoglobin. When the mass of dead plant material in river mud is very high, the population size of the other species decreases but the Tubifex population size continues to increase. Explain why the Tubifex population continues to increase while populations of other species decrease.

Suppose that on a small island off the coast of scotland, 32 percent of the population has blue eyes, which means that these individuals must be homozygous for the blue eye color gene (bb). the only other eye color found on the island is brown, and individuals that are homozygous for the brown eye color gene (bb) or heterozygous (bb) will have brown eyes because brown is the dominant gene. assume this population is in hardy-weinberg equilibrium. if 100 babies are born next year, how many of these would you expect to have brown eyes and be heterozygous? a. 58 b. 49 c. 29 d. 43