How do retroviruses such as hiv differ from other viruses?

Witch theory suggests all living things are made up of cell or cells

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?

Label the following as inner or outer planets; a) has 67 moons made mostly of hydrogen and helium b) has rings c)no moons, high volcanic activity d) known as the red planet, has 2 moons e) very thin atmosphere, moons or rings