Creativity is an important tool for scientists because it can often make up for the limitations of the current technology that scientists in different fields, not only biologists, are facing. For that reason, early biologists could think of and apply innovative and creative ways how to measure a certain thing they were interested which then came around the limitations of the technology they were using :)
Probably like 2 hours or so
The answer is C. a double helix
C) blood, blood vessels, and heart.
The answers that apply are;
Psychology is a field that endeavors to learn the mechanisms of the mind and how this influences thought, feelings, and behavior. Therefore a psychologist or therapist, who is able to understand this relation, has the capacity to evaluate his thoughts and actions and can help another person with psychological problems.