1
AssignmentMultiple Select

The Circulatory and Respiratory Systems

Question 1 • 2026 Summer 305 CR_2002040-M/J Comprehensive Science 1

Which substances do cells need to produce energy? Check all that apply.oxygenwatercarbon dioxidesun’s energysugar molecules

Answer
A
oxygen
B
water
C
carbon dioxide
D
sun’s energy
E
sugar molecules

Explanation

Cells release usable energy through cellular respiration, which uses sugar molecules (such as glucose) and oxygen. Water is produced during this process, while carbon dioxide is a waste product. Sunlight is used by plants to make sugars, but cells do not use sunlight directly to release energy from sugar.

AI-written and checked against the verified answer.