After his stroke, Brian slowly recovered function in his right arm. The property of the brain that supports learning and recovery of functions lost after brain trauma and that reflects the interactive nature of biological and environmental influences is called

a. an action potential.
b. neurotransmission.
c. plasticity.
d. gray matter.

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling