What interactions can happen between two populations in a community

The answer is Neutralism, amensalism, commensalism, mutualism, and competition. 

Neutralism is the most common type of interactions between populations in which neither population affects the other one.
Amensalism is a relationship between two population in which only one of them suffers, and the other one is not affected. 
Commensalism is a relationship between two population in which only one of them has benefit, and the other one is not affected. 
Mutualism is a relationship between two different populations in which both species benefit. 
Competition is an interaction between populations in which they compete for limited resources. 

Ты не знаешь ни английского языка

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.