Question

Population growth or population dynamics? Consider graph D. What type of relationship is indicated by this population model?
Responses
A competitioncompetition
B mutualismmutualism
C parasitismparasitism
D predator-prey

Answer 1

I don’t have the image of graph D — could you upload it or describe it (e.g., do the two population curves rise and fall together, opposite each other, show oscillations, etc.)?

How to tell:
- Competition: both species’ population sizes are reduced when together (both curves depressed compared with when alone); typically both decline or reach lower equilibria.
- Mutualism: both populations increase when together (both curves rise).
- Parasitism (or disease): one population (the host) is reduced while the other (the parasite) benefits; often the parasite reaches high numbers while the host is suppressed; may or may not oscillate.
- Predator–prey: characteristic cyclic/oscillating populations with a phase lag — prey peaks first, predator peaks shortly after, then both decline in cycles.

If graph D shows regular oscillations with the predator curve lagging behind the prey curve, choose D (predator–prey). If you share the graph or a short description I’ll pick the correct option.