Kyle plants a group of seeds in a pot of enriched soil, and provides all the seeds with identical temperature, lighting, and water. When his plants are mature, he notices that they are quite different in height. Which of the following is the best conclusion Kyle could draw from his observations?
a. The differences in the height of his plants are due to equal contributions of environmental and genetic variables.
b. Holding the plants' environment constant has magnified the influence of genetic differences on the height of the plants.
c. Genetic variables are more influential than environmental variables in determining the height of Kyle's plants.
d. Kyle lacks sufficient information to draw any scientific conclusions from his observations.
Question 2
Muscle fibers respond to
a. serotonin.
b. glutamate.
c. dopamine.
d. acetylcholine.
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