Everything goes through respiration
In terms of the net reactants and products, yes, cellular respiration is the reverse of photosynthesis.
Cellular respiration: Glucose and oxygen are used to make ATP, carbon dioxide, and water.
Photosynthesis: ATP, carbon dioxide, and water are used to make glucose and oxygen.
However, their pathways are NOT the reverse of each other. The enzymes involved are vastly different for each, so only the net reaction is the "reverse."
I believe it's feeding relationships between different organisms
The scratch test.
The scratch test is used by scientists and people who study rocks and minerals to determine the strength of the rock. They have the scratchers numbered one through ten and scratch the rock or mineral until the scratcher makes a mark in the mineral then they know the strength of the rock.
