When you look at the night sky sometimes there is a full moon and sometimes the moon looks like its barely there. why does this happen

this happens because of the reflection of light that comes from the sun. remember that the earth,sun and moon all orbit

d. pushing his plate away from the edge of the table idk what the other guy was trying to

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).