Alayer of material that block the transfer of heat between the air inside and outside a building is called a. an active solar system. b. a solar cell. c. a heat exchanger. d. insulation.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

possibly, yes.

explanation:

the amount of sugar you take in is dangerously high, risk of heart disease, high risk of diabetes, and etc.