Cross sectional studies is the correct answer.
Cross-sectional research is used to examine participants' behaviors of different ages at one point in time. These studies are useful for a variety of reasons: data collection can be proceeded rapidly, the cost is a lot lower than a logitudinal research since there is no need to keep contact and follow-up with participants as time passes, and because of that practice effects are not a problem. On the other hand, the principal limitation of this research is that the results produce information regarding age-related change, instead of development per se.
What do you mean by this?
Answer:
The answer is a. autism spectrum disorder.
Explanation:
This disorder, which usually appears during early childhood, presents symptoms such as difficulties in social interaction, repetitive behaviours and a tendency to be extremely organised. It is called "spectrum" because the symtpoms may vary from person to person.
The causes for this disorder are unknown, and no standard treatment has been found.
Mainly, the gold rush and warmer climate to farm. This drove people to settle in the west and south.
It is more detailed than the customary system
