Answer:
A. A cell
Explanation:
Cells are the building blocks of life.
They are the biological units of organisms and are the basic structural and functional units of life.
Cells are the smallest units of life.
Answer:
C Temperature at which the mixture freezes
Explanation:
Measuring the temperature at which the mixture freezes provides a good way for the student to arrive at her conclusion.
- The variable being tested for in this experiment is the freezing point of the water anti-freeze mixture.
- The dependent variable which is the freezing point is of prime concern.
- Amount of the antifreeze added is the independent variable. It is the cause of the phenomenon desired to be observed in the experiment.
A. pressure increases in the artery and causes the heart to work more
When the artery cannot expand the pressure builds up in the smaller space that remains. As the pressure builds, the heart has to work harder to push the same amount of blood through that smaller opening.
Hope that helps.
