Please help me, i am having a hard time

See the explanation below.

Explanation:

a)

In order for this circuit to work, the batteries must always have positive and negative contact. So you must reverse the location of one of the batteries so that this circuit can work.

b)

For this circuit to work, one of the wires must be connected to the positive port of the battery, the current may flow from the negative to the positive pole.

c)

For this circuit to work, the circuit must be closed completely, so that the current can flow around it and all the elements connected to the circuit will receive current.

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.

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank