Because of wide variations in seasonal and annual precipitation
Answer:The population was becoming too old
Explanation:
His backgrounds in mathematics and engineering was demonstrated in:
<span>- his development of statistical analysis methods
- his invention of a machine to calculate correlations,
- the issue of postulates and axioms in his system
- his descriptions and explanations of behavior in mathematical equations
Due to this characteristic, Clark L Hull managed to provide accurate data/measurements in studying the correlateon between motivation and behaviors and what caused them. Due to this findings, his school of psychology dominated the field in 1940s.</span>
