The kidneys remove which cellular waste product from blood?
a. undigested food materials
b. carbon dioxide
c. urea
d. oxygen

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.

What enzyme is most important for dna replication and why?

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?