| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
blood cells |
|
capillaries |
|
diaphragms |
|
bronchioles |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
reflection |
|
convection |
|
radiation |
|
conduction |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
-40°F is how many °C?
\({40 \over 9}\) |
|
-8 |
|
-40 |
|
\(-{40 \over 9}\) |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
large intestine |
|
mouth |
|
stomach |
|
small intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
Which of the following would be used in eye glasses to correct nearsightedness?
convex lens |
|
concave lens |
|
convex mirror |
|
concave mirror |
Unlike curved mirrors that operate on the principle of reflection, lenses utilize refraction. A convex lens is thicker in the middle than on the edges and converges light while a concave lens is thicker on the edges than in the middle and diffuses light. A common use for curved lenses is in eye glasses where a convex lens is used to correct farsightedness and a concave lens is used to correct nearsightedness.