A Species of Bacteria Is Known to Live in the Skin

question 27

Multiple Choice

A species of bacteria is known to live in the skin and other organs of puffer fish.These bacteria produce a toxin that the puffer fish use to poison predators.The bacteria benefit from living on the puffer fish by receiving a host.This is an example of

• A) Parasitism
• B) Mutualism
• C) Interspecific competition
• D) Exploitation

---

Definitions:

Average Total Cost

Average total cost is the total cost of production (fixed plus variable costs) divided by the total quantity produced, indicative of the cost per unit at different levels of output.

Average Variable Cost

The total variable cost per unit of output, found by dividing total variable costs by the quantity of output produced.

Fixed Cost

Costs that do not vary with the level of production or sales, such as rent, salaries, or insurance premiums.

Eyeglasses

Corrective or protective lenses mounted in a frame to aid vision or protect the eyes.