Examlex
Calculate the formula mass of ammonium arsenate, (NH4) 3AsO4.
Invertebrates
Animals that lack a vertebral column, or backbone, including species such as insects, mollusks, and crustaceans.
Human Intelligence
The mental capacity to learn, reason, solve problems, and adapt to new situations.
Francis Galton
A 19th-century English polymath who contributed to fields like statistics, psychology, and anthropology, and is known for his research in eugenics and psychometrics.
Mary Calkins
An early 20th-century psychologist and philosopher known for her work in memory and the first female president of the American Psychological Association (APA).
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