Answer:
They created the wheel and they created levees to hold back the floods from their fields and cut canals to channel river water to the fields
Explanation:
Yes, that's true. Strong a<span>rgument should be supported by evidence. </span>
Because it's less dense than liquid water.
Answer:
In voting, volunteering, participating in group activities, and community gardening.
Answer:
naturalistic observation
Explanation:
In naturalistic observation, researchers will gather data by directly observing the subjects in their natural habitat without making any intervention.
This is what Professor Ober is doing.
Professor Ober wants to collect a data about development of their physical skills among children. This means that the <u>children are his research subjects.</u>
To collect his data, professor Ober observed the children in the playground (which is the children's natural habitat). He also did not told the children to do anything , he just quietly observe and let the children do what they usually do. (not making any intervention)
