Why isn’t there a lunar eclipse every time Earth is in between the sun and the Moon?

(this might be the wrong subject, but I didn't know what subject to put it to)

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

What molecule contains an organisms genetic material, passed down from parents to their offspring