Question

molecule composed of carbon, hydrogen, and oxygen that organisms use for energy
a. carbohydrate
b. glucose
c. model
d. chemical energy
energy stored in a molecule
sugar that organisms use for energy
representation of an idea or object that helps you un-

Explanation:

1. For "molecule composed of carbon, hydrogen, and oxygen that organisms use for energy", the definition matches carbohydrate (a), as carbohydrates have C, H, O and are energy sources.
2. For "energy stored in a molecule", this is chemical energy (d), as chemical energy is stored in molecular bonds.
3. For "sugar that organisms use for energy", glucose (b) is a simple sugar used for energy.
4. For "representation of an idea or object that helps you un-...", this is model (c), as a model represents concepts/objects.

Answer:

1. molecule composed of carbon, hydrogen, and oxygen that organisms use for energy: a. carbohydrate
2. energy stored in a molecule: d. chemical energy
3. sugar that organisms use for energy: b. glucose
4. representation of an idea or object that helps you un-...: c. model