Answer:
cross-sectional study
Explanation:
A type of study in which data is gathered at one time from groups of participants who represent different age groups is an example of a cross-sectional study. A cross-sectional study is a type of study design that involves subjects who vary in the variable of interest such as age but have a common characteristics and observations are made at a single point in time.
In the scenario from the question, the variable of interest is most likely the effect of varying age groups on personal health. The variable of interest, age group varies but the population has a common characteristic which is that they are Americans and the study is done at a particular time and not spread out as in cohort studies. This is an example of a cross-sectional study.
There once lived a single - celled ancestor that gave rise to two lines of evolution --- one leading to the living choanoflagellates and the other to animals .
Its water was used for irrigation of crops there was no other source of water
Answer:
I think its C. an increased amount of soil erosion and poor quality due to lack of roots and nutrients
Explanation:
I am not sure hough but hope it helps.
Explanation:
Because forced assimilation had nearly destroyed Native American culture, some tribal leaders attempted to reassert their sovereignty and invent new spiritual traditions. The most significant of these was the Ghost Dance, pioneered by Wovoka, a shaman of the Northern Paiute tribe.
