Answer:
c.
Explanation:
c. dismissed the idea that species are constant and emphasized the importance of variation and change in populations.
I think they arrested people who disagreed with the government.
Answer: Observational Study
Explanation: An experiment requires a scientist to observe subjects of the study under specific conditions where an independent variable is involved and controlled by the scientist.
An observational study on the other hand is in an uncontrolled environment and the scientist does not have any control on the variables. An example is polls. The purpose of this type of study is to get statistical values without interfering with the the subjects of the study.
Hicham El Guerrouj is the current men's record holder with his time of 3:43.13, while Svetlana Masterkovahas the women's record of 4:12.56.
Answer:
Secondary reinforcers
Explanation:
A secondary reinforcer is a type of stimulus or situation that functions as a reinforcer because it has been paired with another stimulus that also functions as a reinforcer. In this case, the reinforcer is the good grade. In turn, the secondary reinforcers are the praise and the money, both of which seem to be effective with Curtis.