(Q).
If the sun's rays can be used for heating a building by a heating system, then what can be used for heating a building by a heating system? Answer choices: - the Sun's rays - peachleaf willow - engines - oxygen - photosynthesis - photons - air - hydrogen and oxygen
(A).
the Sun's rays

(Q).
If something specialized to detect a stimulus is found mainly in the skin, then something specialized to detect a stimulus is found mainly where? Answer choices: - fields - humans - bushes - bats - a path - skin - retina - Birds
(A).
skin

(Q).
If biomes that have suffered mainly from pollution have water that contains little or no salt, then biomes that have suffered mainly from pollution have water that contains little or no what? Answer choices: - Toxins - CO 2 - liquid - salt - Lead - Carbon - Acids - sulfur
(A).
salt