Which statement is an example of a scientific theory? a. the amount that caffeine affects a person's heart rate differs based on the person's age. b. the earth is the third planet from the sun and has one moon, which orbits the earth. c. hummingbirds do not like the color white because they visit other colored flowers more often. d. all living organisms are composed of one or more cells, which came from pre-existing cells.

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3

Which is the best example of plant tissue? the answer is d (just took the test)

Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing