Iwill give u brainlest plz ! what do active solar heat systems have that passive systems do not have? a. fans and pumps b. tubes for conducing heat c. areas to collect sunlight d. solar collectors

fans and pumps

Explanation:

false

because it does not have the potential to be entirely used up

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: