(Q).
Phytoplankton are bacteria and algae that use sunlight to make food, and sunlight beams down on the different types of algae. Given these facts, phytoplankton use what to make food among the following options: - sun's heat - sunlight beams - refraction of light - heat energy - visible energy - by indirect light - produce light - Positive charges
(A).
sunlight beams

(Q).
Fire converts chemical energy into light and heat energy, and fire is a natural energy source which provides heat, light and energy. Given these facts, what does fire provide among the following options: - warmth - fuel - light - water - ice - air - oxygen - cells
(A).
light

(Q).
Brain cells die quickly if their oxygen supply is cut off, and if the oxygen supply to the brain is cut off, a stroke can occur. Given these facts, what die quickly if a stroke occurs among the following options: - a fish - animals - brain cells - organs - critical organs - protons - neutrons - bones
(A).
brain cells