A researcher decides to investigate whether there are any changes in people's IQ scores from early adulthood through middle adulthood. He begins with a sample of 21-year-olds and plans to follow this group until they are 50 years old. The type of research design he is planning to use is called

This is called an "OBSERVATIONAL RESEARCH".

Explanation: An Observational research is a type of research were we get our result by observing samples act on it own natural course, without influencing it with any substance. We have two type of research design, Experimental and Observational research design.

Because the researcher has chooses a particular group and decide to observe them, grow and act on their natural course, without giving any substance to them, his research model is Observational.

Experimental research design is when a substance is added to a sample to compare it with another sample

answer: cannibalism, the capac raymi, capacocha, the eight day feast, the combing of the hair

explanation:

the incas have many rituals, cannibalism was always a very ritual thing, which was normally tied to sacrifices, warfare, death, and regeneration.

  the capac raymi was one of the most important ceremonies. it occurred around the summer solstice and was when they worshiped their sun god, also known as inti.

  the capacocho was another one of their most important ceremonies. it was when many children where selected to start their training, and these children where destined to become sacrificial blessings to their sun god, inti. being chosen for this ritual was a blessing.

  the eight day feast was a feast that lasted 8 days and, each day, the day began with a chanting at dawn. a follow up song at noon. which ended with complete silence at the end of the day. on this day, inca royalty was always dressed in silver and gold laced clothing.

  the combing of the hair was the most important ritual to young girls. this ritual was known as the coming of age ceremony, but only the most beautiful girls where chosen. in this ceremony, the girls chose their new name and where chosen as either brides, or princesses of rulers.

answer; proximity;