A diagram shows how a primitive eukaryotic cell may have gained chloroplasts after engulfing a photosynthetic prokaryote.
Which conclusion is best supported by this event?
Rabies is a viral disease that primarily affects mammals such as dogs, bats, and raccoons, but it does not infect reptiles or fish.
Which of the following best explains why rabies only affects certain animals?
A student observes two unknown cells under a microscope.
Cell A has ribosomes, free-floating DNA, and a cell wall but no nucleus.
Cell B has ribosomes, DNA inside a nucleus, and membrane-bound organelles.
Which TWO statements correctly compare Cell A and Cell B?