Qin Shi Huangdhi was the king of the state of Qin, hence the title of Qin in front of his name. A big thing that he did was unify China in 221 BC after he conquered all of the other warring states in the China region. He brought peace and prosperity to China after that.
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Answer:
A person who represents our country or state
Explanation:
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.
Answer: 1. separates the material inside the cell from the outside environment
2. also allows material to pass in and out of the cell, if it is safe to do so
3. protects the nucleus and cytoplasm
Explanation: Mitochondria is the powerhouse of the cell. So thats not right. The other three are right. The cell membrane protects the cell by either blocking material that tries to come to the cell or pushing out material from within the shell.
