Question

(1) what do plants need for photosynthesis? (2) what are the products of photosynthesis? (2) animals cannot photosynthesize, why?

Explanation:

Step1: Identify reactants for photosynthesis

Plants need carbon - dioxide ($CO_2$) and water ($H_2O$) along with light energy for photosynthesis.

Step2: Determine products of photosynthesis

The products of photosynthesis are glucose ($C_6H_{12}O_6$) and oxygen ($O_2$).

Step3: Explain why animals cannot photosynthesize

Animals do not have chloroplasts which are the organelles in plant cells that contain chlorophyll and are the site of photosynthesis.

Answer:

(1) Reactants for photosynthesis: Carbon - dioxide and water.
(2) Products of photosynthesis: Glucose and oxygen.
(3) Animals cannot photosynthesize because they lack chloroplasts.