Question

small molecules are combined to form large molecules by the life function of
1 regulation
2 excretion
3 transport
4 synthesis

Explanation:

To solve this, we analyze each option:

• Regulation: Maintains internal balance, not about molecule combination.
• Excretion: Removes waste, not molecule building.
• Transport: Moves substances, not combining molecules.
• Synthesis: Defined as combining small molecules into larger ones (e.g., anabolic reactions in biology). So synthesis matches the description.

Answer:

1. synthesis