Pleaseee pleasee help :)

What does the number 18.9984 represent in the image?

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?

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