They were looking for gold.
Answer:
c. concrete operations
Explanation:
Concrete operations: This is the third stage in the cognitive development theory which is given by Jean Piaget. This stage starts in middle childhood from the age of seven and lasts around eleven years. It is distinguished by the development of rationale, logical, and organised thinking in an individual.
According to Piaget, the concrete operations developmental stage is involved.
<span>The increase in IQ scores over time suggests environmental factors have a strong influence on intelligence.
</span>Our intelligence depends on predisposition and the environment.
Our genetic <span>predisposed is not going to change over time but the type of life
we lead also affects intelligence.</span>
Lewis and Clark was a group of men in the military, known as the Corps of Discovery and civilians. Led by their leader Meriwether Lewis and Lieutenant William Clark to explore the land obtained by the United States in 1803. Known as the Louisiana Purchase.