Use the research scenario below to answer the following questions. A researcher is interested in whether the extract of truffles (a type of fungus with interesting chemical properties) can increase fertility. It is known that female pigs are extremely attracted to the smell, which appears to mimic a sex pheromone, although the exact mechanism is unknown. The researcher took 1000 women of child-bearing age and randomly selected 500 to go into the treatment group, which consumed 1000 mg of truffle extract in pill form daily. The control group received a placebo. After two years, the treatment group had a 440% increase in successful pregnancies compared to the placebo group. Oddly, the placebo group had a 230% increase in successful pregnancies compared to the national average. What is the independent variable?

A study examines 10,000 participants over twenty years to investigate the causes of drug use. Compared to a study of 15 participants interviewed once, this research is generally:

If the researchers knew what group the test subjects were in, but the subjects did not, how would you describe this study?

If cells are exposed to unusually high concentrations of a hormone for a long period of time, they may respond by:

According to Cannon’s postulates, the sympathetic and parasympathetic nervous systems are an example of:

Use the diagram to answer the following questions. What is the hypothalamus releasing at point A on the diagram?  

Which type of signaling requires direct contact between membrane proteins on adjacent cells?

Which cells are responsible for producing new bone tissue?

This individual is likely to have the smallest percentage of water in their body.

Choose all the myelinating glial cells in the list.