Which characteristic do both viruses and bacteria have in common? A. They contain a nucleus and organelles.

B. They make their own food,

C. They require a host cell to reproduce.

D. They contain nucleic acids such as DNA and RNA.

At which location in earth’s interior does the top density continue to increase as thickness decreases?

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells