1- in a species of mice, brown fur color is dominant to white fur color. when a brown mouse is crossed with a white mouse all of their offspring have brown fur. why did none of the offspring have white fur?

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.

Why are human population trends difficult to predict?