Which of the following is not an exercise myth?
a. aerobic exercise is all that matter
b. women who strength train will bulk up
c. low to moderate level of exertion can be sustained over long periods of time d. exercise has to be strenuous to be beneficial

i am single too don't feel bad

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.