During research in the 1940s and 1950s, no variations in personalities were found across the cultures t or f

False

Explanation:

It is false that during these years no variation in personalities were found across cultures. In fact, during these years, researchers realized that an individual's personality varies significantly based on their cultural background. While this does not absolutely determine a person's character, it does represent an important influence.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.