Which process uses energy to combine inorganic
molecules to synthesize organic molecules?
(1) respiration (3) photosynthesis
(2) digestion (4) decomposition

The process which uses energy to combine inorganic molecules to synthesize organic molecules is referred to as(3) photosynthesis.
The chemical energy which is basically formed in carbohydrate molecules for each sugar and are being synthesized by water and carbon dioxide. Photosynthesis is also performed by most cyanobacteria and algae.
Some of this organisms are called photoautotroph. Photosynthesis is well known for maintaining and producing oxygen content of the earth's atmosphere. The process of photosynthesis begins when energy which is from light is being absorbed by proteins known as reaction centers and contain green chlorophyll pigments.
When in plants the proteins are being held inside the organelles known as chloroplasts and abundant in life cell.