| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.58 |
| Score | 0% | 72% |
A major difference between sound waves and light waves is which of the following?
a sound wave is much slower than a light wave |
|
a sound wave is mechanical while a light wave is electromagnetic |
|
a sound wave cannot travel through a vacuum |
|
all of these are correct |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
Which of the following is not part of the carbon cycle?
respiration |
|
photosynthesis |
|
decomposition |
|
precipitation |
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.
__________ and __________ pair to strengthen bones.
iron, calcium |
|
calcium, vitamin A |
|
vitamin D, magnesium |
|
vitamin D, calcium |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
The __________ is a system of muscles that allows breathing.
bronchioles |
|
pulmonary |
|
trachea |
|
diaphragm |
The diaphragm is a system of muscles that allows breathing. During inhalation, the diaphragm expands and air rushes in to fill the space created. Then, during exhalation, the diaphragm contracts and forces the air back out.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
vertebrate |
|
sentient |
|
spiny |
|
arthropod |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.