which of the following pair of organisms represents a predator-prey relationship?

a- flea and dog
b- robin and tree
c- polar bear and seal
d- bacteria in human large intestine and human

To determine which pair of organisms represents a predator-prey relationship, we need to understand the concept of predator and prey. Predators are organisms that hunt, kill, and consume other organisms known as prey. Prey, on the other hand, are organisms that are hunted and consumed by predators.

Let's analyze the given options:

a) Flea and dog: Fleas are parasites that feed on the blood of animals, including dogs. However, this is not a predator-prey relationship, but rather a parasitic relationship.

b) Robin and tree: Robins are birds known to make their nests on trees but they don't prey on trees. Instead, their diet mainly consists of worms, insects, and fruits. Hence, this is not a predator-prey relationship.

c) Polar bear and seal: Polar bears are apex predators that primarily feed on seals. Seals are the main prey for polar bears, making this option the correct choice representing a predator-prey relationship.

d) Bacteria in human large intestine and human: This is not a predator-prey relationship. Bacteria in the human large intestine live in symbiosis with humans, aiding in digestion. They are not considered predators that consume humans.

Therefore, the correct answer is c) polar bear and seal as they represent a predator-prey relationship.

http://www.seaworld.org/infobooks/polarbears/pbdiet.html