• Type of food available
• Availability of food
• Method of obtaining food

Type of food available
Example:

• A cow eats grass (plant food).
• A lion eats flesh (animal food).

Availability of food
Example:

• Fungi grow on dead and decaying matter where such food is available.
• Parasites live on living organisms to obtain food continuously.

Method of obtaining food
Example:

• Amoeba engulfs food with pseudopodia.
• Human beings chew and digest food inside the body.
• Cuscuta absorbs food from host plants.