In the context of a predator-prey relationship, we consider which organism hunts and feeds on another. Let’s review the options:
- a) Flea and dog: Fleas feed on the blood of dogs, which makes this a parasitic relationship rather than a classic predator-prey relationship.
- b) Robin and tree: Robins are often found in trees, but they do not prey on trees. Instead, they might eat insects or berries found in trees, making this option incorrect.
- c) Polar bear and seal: Polar bears hunt and eat seals, which is a clear example of a predator-prey relationship. The bear is the predator, and the seal is the prey.
- d) Bacteria in human large intestine and human: While bacteria do interact with humans, they are not preying on humans. Instead, they often have a symbiotic relationship, benefiting from their host without causing harm.
Therefore, among the listed pairs, the correct answer is c) polar bear and seal as they exemplify a true predator-prey dynamic.