If you must do positive work to bring a charged balloon toward a negatively charged sphere, is the charge on the balloon positive or negative? or can it have any sign?

b.transmitters send radio waves, and receivers capture radio waves.

the answer is mosques. they are an important part of islamic culture.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).