It was a source of food and trade.
Answer:
B). A Cross-sectional research design.
Explanation:
A cross-sectional research design is demonstrated as a kind of observation study that involves the study and analysis of a representative subset from the population at a particular point of time.
In the given example, Tucker is employing 'cross-sectional research design' as he selects a representative subset('a group of 5-year-olds, a group of 10-year-olds, and a group of 15-year old) from the population at the same time for study and analysis(by interviewing them) . This implies that Tucker adopts a '<u>cross-sectional research design</u>.'
Answer:
The correct answer is C. Fixed ratio and fixed interval schedules
Explanation:
Emma is a video game programmer. She writes the code for a game in which players are awarded five points every time they complete three tasks in the game. The players are also awarded five points at midnight every day. In the context of operant conditioning, the award of five points follows the FIXED RATIO AND FIXED INTERVAL SCHEDULES of reinforcement.
A yield sign refers to the sign that allows a driver to give way to another driver on the road or the people walking on pedestrians or cyclists.
<h3>Who is the driver?</h3>
The driver is an individual who drives the vehicles like cars, trucks, etc. while traveling on the roads.
While traveling on roadways or highways, when the driver needs to stop if required and requires the other driving persons, walking people, or the cyclists to go to their respective destinations, then the signboard that comes in the way is called a yield sign.
Therefore, the meaning explained in part B would be considered a yield sign.
Learn more about the yield sign in the related link:
brainly.com/question/14288531
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