A. Lizards often lie in the sun in the mourning. Why?

B. Basking sharks swim close to the surface of the water and appear to be sunning themselves like lizards. In fact, however, they are feeding on plankton. Why might a land-dwelling creature like a lizard need to sun itself, while a water-dwelling creature like a shark does not?

C. Some species of lungfish breathe only air; they have no gills, and will drown if forced underwater. Why might it be an advantage for lungfish to breathe air even though they live in water?

D. Arthropods and birds both molt. For witch of these creatures is molting most dangerous? Please describe by comparing the two molting processes.