| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.66 |
| Score | 0% | 73% |
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
spiny |
|
sentient |
|
arthropod |
|
vertebrate |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Examples of secondary consumers include:
chickens |
|
wolves |
|
grasshoppers |
|
plankton |
Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.
Arteries carry __________ blood at __________ pressure.
oxygenated, high |
|
oxygenated, low |
|
deoxygenated, low |
|
deoxygenated, high |
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.
The rate of vibration of sound is called:
volume |
|
amplitude |
|
frequency |
|
period |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
large intestine |
|
stomach |
|
small intestine |
|
mouth |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.