A population density map shows?
A.
the ages of people in an area.
B.
the income of people in an area.
C.
how many people are from a certain area.
D.
how many people live in a certain area.

According to subpart d, research with children may be eligible for exemption when: the children will be asked to complete a surveythe research involves the use of educational teststhe children will be interviewed by the researcher.the research with children will involve participant observation with researcher interaction.

Spanish for "estate," this was a type of plantation or other economic activity in spain's "new world" colonies.

Why is the industrial revolution important to us now? brainliest to the best answer