The interaction between members of the same population over scarce resources is called

Step 1: Analyze the question The question asks for the term describing interaction between members of the same population (same species) over scarce resources (food, water, space, mates, light).

Step 2: Concept Competition is an ecological interaction in which organisms strive for the same limited resources. It comes in two types:

• Intra-specific competition: between individuals of the same species. "Intra" means within. Example: two cockerels fighting over the same hen, or maize plants on a crowded farm competing for light and nutrients.
• Inter-specific competition: between individuals of different species. "Inter" means between. Example: lions and hyenas competing for the same prey.

Step 3: Solve

• A. Behavioural adaptation: a change in behaviour that helps survival (e.g., migration). It is not an interaction over resources. ✗
• B. Inter-specific competition: involves different species, but the question says the same population. ✗
• C. Intra-specific competition: same species competing for limited resources. ✓
• D. Morphological variation: differences in form or structure among individuals. ✗
• E. Structural adaptation: a body feature that aids survival (e.g., webbed feet). ✗

Step 4: Answer The correct option is C. intra-specific competition.

Tip: Remember the prefixes: INTRA = INSIDE the species, INTER = BETWEEN species (think "international" means between nations). Whenever a question says "same population" or "same species," look for "intra."