To a demographer, a group of people that begin something at the same time is known as:
a) a cohort.
b) a team.
c) a dependency ratio.
d) a transnational migrant.
e) a baby boom.

a) a cohort.

Explanation:

Cohort is a term which is used in marketing, statistics and demography. It describes a group of people who share a defining characteristic - a group of people who share a common event. This type of data is more accurate than period data, also used by the demographers.

On the other side, cohort data has some disadvantages. It can take a long amount of time to collect all the necessary data for a study. Also it can be really costly, and a lot of money is necessary to conduct a successful research. Two important cohort study types are prospective and retrospective cohort study.

i would think yes.

explanation:

because we have every natianlity in our country which makes us so diverse and unique. that's why in a lot of cities there are places like little italy, koreatown, chinatown.  

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

i am brianly

sorry if this doesn't