When two experiments are identical except for one variable, the experiment is called a controlled experiment
Glucose Produces food for plants in a food web
When the continents separated, organisms were forced to be placed in different locations with different environmental conditions. In order to survive in their new environment, over time, various flora and fauna developed various body mechanisms to cope up. This brought up the speciation of flora and fauna.
The sun! It's solar radiation heats our planet, gives us light, and sustains life.
