Arancher wants to investigate the use of artificial selection in his cattle herd. which of these options is an example of artificial selection?

a) breed a cow that produces large quantities of milk with a bull that comes from a line of cattle with long lifespans.

b) trace the family tree of a chicken that lays many eggs back through several generations.

c) separate a population of rabbits and monitor any trait changes over the next few generations.

d) choose one individual in a population of sheep to favor with food and shelter and see if it mates more.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.