This problem has been solved! see the answeran 80-mm-focal-length lens is used to focus an image on the film ofa camera. the maximum distance allowed between the lens andthe film plane is 120mm.(a) how far ahead of the film should the lens be if the object tobe photographed is 10.0m away? (b) 3.0m away? (c) 1.0m away? (d) what is the closest object this lens could photographsharply?

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.

a.   mass number from atomic number