If B = the benefit of a behavior to a recipient, C = the cost of the behavior of the donor, and r = the degree of relatedness between the recipient and donor, then if rB ___ C, altruism can evolve.

If B = the benefit of a behavior to a recipient, C = the cost of the behavior of the donor, and r = the degree of relatedness between the recipient and donor, then if rB > C, altruism can evolve.

True

Explanation:

In biology, altruism refers to behaviour by an individual that increases the fitness of another individual while decreasing the fitness of the actor ... Altruistic behaviours appear most obviously in kin relationships, such as in parenting, but may also be evident among wider social groups, such as in social insects.

Hamilton's rule predicts that each social action arises only under certain combinations of values of r, b and c [7,9] ... For example, Hamilton's rule finds that positive relatedness is a necessary condition for the evolution of altruism and that altruism evolves more readily when b is high and c is low.

Hamilton's rule states that if rB>C then a gene giving altruistic behaviour will increase in frequency in the population