A B C OR D? Please help

Aflashlight produces light using energy from the batteries. in which order does the energy change form? a. from chemical to electric to light energy b. from electric to light to chemical energy c. from electric to chemical to light energy d. from light to electric to chemical energy

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

Why do we perceive objects as retaining their brightness under different lighting levels?