Answer:
The correct answer is - B. better medical facilities and treatments.
In the past century, the life expectancy in the United States have increased significantly, in fact it is almost doubled. The death rates have decreased for around 40% and the biggest reason for this trend are the advancements in the medical field. The medical facilities and treatments have improved significantly. The technological advancements contributed to the medical field a lot, made it much more efficient, and because of that the prevention of diseases, curing, and the saving of lives have skyrocketed, resulting in much better, healthier,and longer life of the population
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Explanation:
When Hana pours the mixture through a filter,
she will likely to collect a solution of salt in water that passes through the
filter. <span>The activity shows the split-up of solids that
are not soluble from a liquid by means of what we called filtration. It can be
used to separate solids that are not soluble from a liquid, or a precipitate
from the reaction mixture that it made. </span>
Atmosphere
biosphere
hydrosphere
the main oxygen cycle is photosenthisis
Observation is the only option that is not a variable in scientific experiment.
<h3>
What are variables in scientific experiment?</h3>
Variables are factors, or condition that can exist in differing amounts during a scientific experiment.
<h3>Types of variables in scientific experiment</h3>
Scientific experiment usually has three kinds of variables:
- independent,
- dependent, and
- controlled.
Thus, Observation is the only option that is not a variable in scientific experiment.
The complete question is below:
Which of the following is not a type of variable in a scientific experiment? A. Independent B. Control C. Dependent D. Observation
Learn more about variables in scientific experiments here: brainly.com/question/574781
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You have to measure the distance between them
