Answer the following question given this paragraph: One of the simplest machines is the lever, which is a rigid bar pivoted at a fixed place called the fulcrum. Torques are involved in levers, since there is rotation about a pivot point. Distances from the physical pivot of the lever are crucial, and we can obtain a useful expression for the MA in terms of these distances. Q: One of the simplest machines is the lever, which is a rigid bar pivoted at a fixed place called what? Choices: - caliper - sling - wheel - fulcrum A:
fulcrum
Answer the following question given this paragraph: Q: In drosophila, gradients of morphogens encoded by maternal effect genes determine what? Choices: - cell mass - cells axes - body mass - body axes A:
body axes
Q: Answer the following question given this paragraph: Q: Eggs are produced in what organs and, upon fertilization, develop in what other organ? Choices: - fallopian tubes, ovaries - cervix, ovaries - uterus, vagina - ovaries, uterus A:
A: ovaries, uterus
Question: Answer the following question given this paragraph: Q: What term is used to describe the attractive force between molecules of the same substance? Choices: - magnetism - attraction - strength - cohesion A:
Answer: cohesion
*Question*
Answer the following question given this paragraph: Heat waves have increased in frequency and duration in recent years. The summer 2011 North American heat wave brought record temperatures across the Midwestern and Eastern United States. Many states and localities broke records for temperature and for the most days above 100 o F. Q: What are all cells surrounded by? Choices: - cytoplasm - cell substrate - amino acids - cell membrane A:
**Answer**
cell membrane
(Q).
Answer the following question given this paragraph: Primary succession occurs in an area that has never before been colonized. Pioneer species include bacteria and lichens that can grow on bare rock and help make soil. Q: What kind of succession occurs in an area that has never before been colonized? Choices: - addition succession - secondary succession - support succession - primary succession A:
(A).
primary succession