<span>Factors contributing to the west ward expansion of the United States include the discovery of gold, the Homestead Act, and the desire for adventure, land and riches. The answers are the third, fourth and fifth statements among the choices that you have included or posted.</span>
Answer:
b. gametic isolation or temporal isolation
Explanation:
Gametic isolation is a type of prezygotic barrier where the gametes (egg and sperm) come into contact, but no fertilization takes place.
Temporal isolation - separation in time such that reproduction occurs at different times of the day, or season or even years. For example, consider the time of day when Evening primrose or Morning glory flowers. The Western spotted skunk mates late summer, whereas the eastern spotted skunk mates in late winter.
Explanation:
The basis of the scientist in dividing the Earth's lithosphere into several segments called plates is the distribution of earthquake epicenters, location of volcanoes, and formation of mountain ranges. ... Majority of them are situated along plate boundaries.
