It is called a population since they are all the same species
Dr. Alvarez is doing research on the subfield of psychology called the behavioral neuroscience. Scientists from the field study the biological foundation of human behavioral characteristics. These scientists are trying to find out what physiological processes and anatomical structures are involved in certain aspects of human behavior.
They would have to experiment on the different types of plants and put them in different environments to test there's physical features but before that they have to make an hypothesis of what would happen and analyze
