In an experiment, a researcher manipulates one variable to see how it affects a second variable. The manipulated variable is called the __________

What is most likely to happen if teratogens are introduced during the germinal period of development?

A. The zygote will not implant on the uterine wall. B. The zygote will be destroyed by the teratogens. C. Major multisystem birth defects are likely to occur. D. It is unlikely that teratogens will have any effect this early in the pregnancy.

After removal of a tumor from the LEFT side of her brain, Sharon recovered well. However, some of her former abilities are now limited. Which of the following abilities are most likely affected?

a. coordinated walking movements b. solving algebra equations c. assembling puzzles d. recognizing objects that she sees