Which of the following is an example of a learned response in animal behavior? a. a spider spins a web.
b. a beaver builds a dam.
c. a bear fishes for salmon in a river.
d. a goose migrates south for the winter.

no moderator inbox me? ?

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers

d.embryo is the correct one

answerblank(1); ecological; blank(2); evolutionary;