Mrs. Jorgensen keeps a flock of chickens in her back yard. One of the roosters is the result of selective breeding by Mrs. Jorgensen. The rooster is especially tall and muscular, and it has especially thick and colorful feathers. What type of breeding is this?

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

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.

Which of the following is a testable hypotheses?