Place the phases of the entire cell cycle in order. #1. chromosomes move away to opposite sides of the cell
12. cell grows
1 3. chromosomes line up across the middle of the cell
14. cell prepares for mitosis
5. cytoplasm is completely divided and new cells are formed
1 6. chromosomes become visible
17. DNA is replicated
18. two nuclei are formed

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

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.

In which layer do organisms on earth love?