| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
Veins carry blood __________ the heart.
back to |
|
all of these |
|
away from |
|
within |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
Leafy vegetables, beans, potatoes, fruits, and whole grains are good sources of:
saturated fat |
|
protein |
|
unsaturated fat |
|
fiber |
Fiber provides bulk to help the large intestine carry away waste. Good sources of fiber are leafy vegetables, beans, potatoes, fruits, and whole grains.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
small intestine |
|
mouth |
|
large intestine |
|
stomach |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
50°F is how many °C?
-10 |
|
122 |
|
58 |
|
10 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (50 - 32)\)
\(C° = {5 \over 9} (18)\)
\(C° = {90 \over 9}\)
\(C° = 10\)
As part of the carbon cycle, plants release carbon into the atmosphere through which process?
evaporation |
|
photosynthesis |
|
decomposition |
|
sedimentation |
The carbon cycle represents the ciruit of carbon through Earth's ecosystem. Carbon dioxide (CO2) in the atmosphere is absorbed by plants through photosynthesis. Plants then die and release carbon back into the atmosphere during decomposition or are eaten by animals who breathe (respiration) the carbon into the atmosphere they exhale and produce waste which also releases carbon as it decays.