2. Rubber, oxygen and paper are all made up of
A cells
B atoms
C wood
D Plastic

A cells

Explanation:

Natrual rubber is a polymer of isoprene

the calvin cycle has three stages. in stage 1, the enzyme rubisco incorporates carbon dioxide into an organic molecule. in stage 2, the organic molecule is reduced. in stage 3, rubp, the molecule that starts the cycle, is regenerated so that the cycle can continue