HELP PLEASE! In a presidential democracy, the head of government is a part of the A executive branch.

B
judicial branch.

C
legislative branch.

D
military branch.

Both the nervous and endocrine systems send electrical and chemical signals for internal communication. select the best answer from the choices provided t f

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

Aheard of sheep moves up in the mountain to graze during summer and migrated to the valley during winter what type of migration do the sheep follow