Which of the following is an example of reciprocal altruism? Group of answer choices
a. A bird squawking to warn its flock of a predator
b. Paying for lunch and saying, "You get the next one"
c. Giving money to charity
d. Leaving a tip in your hotel room for the maid

d. Leaving a tip in your hotel room for the maid

Explanation:

the correct answer is ) possibility.

demonstrating opportunity cost is done through production possibility.

the opportunity cost can be demonstrated using the production possibility frontier or curve. this graphic shows the total number of possibilities for two products when we have the resources needed and used in an efficient manner. the main resources could be money, labor, and technology. the curve shows that the production of one good increases when the production of the othe