1. In your own words define natural selection? (4 points)

2. What is the difference between natural selection and artificial selection? (4 points)

3. Label each one of the following graphs: Disruptive, Stabilizing, Directional. Which of the following charts
epresents a population that could potentially experience speciation? (4 points)

4. There are three types of reproductive isolation: Temporal Isolation, Geographic Isolation, and
Behavioral Isolation. Define each of these. (3 points)

Match each of the three types to one of these.
5. Using different mating calls to attract their mate. _
6.The populations' mating and nesting grounds are separated by the river. _
7. One population's mating season is spring while the other is fall. _

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Explain why the plants cortex would serve as the best food source for animals

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?