The process of organisms fighting for mates food and living space is called

The process of organisms fighting for mates food and living space is called competition.

Explanation:

Ecological interactions of organisms include adaptations, interdependence with each other and competition.

Although there is an abundance of natural resources for food and space, due to ever increasing demands and evolutionary and environmental changes, organisms constantly compete with each other for resources like food and space.  

Organisms fight or compete with each other for food, shelter, mate, sunlight etc.

The autotrophs need to compete with each other for resources needed for photosynthesis like water, carbon dioxide, and other nutrients and minerals present in the soil. Similarly other consumers compete with each other for food. This competition may be interspecific (between two or many species) or intraspecific (within the same species).

Biodiversity helps to balance the ecological systems and avoid this competition between organisms.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.