| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.02 |
| Score | 0% | 60% |
What part of the nervous system is responsible for controlling involuntary actions like breathing, swallowing, and heartbeat?
cerebellum |
|
spinal cord |
|
medulla |
|
cerebrum |
Part of the brainstem, the medulla is the connection between the brain and the spinal cord. It controls involuntary actions like breathing, swallowing, and heartbeat.
Meteoroids, meteors and meteorites are categorized based on which of the following?
their density |
|
their location |
|
their temperature |
|
their size |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
reflection |
|
Doppler effect |
|
sound radiation |
|
refraction |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
In taxonomy, domains are the broadest classification of life. How many domains are there?
3 |
|
5 |
|
6 |
|
dozens |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
reactants |
|
ions |
|
products |
|
isotopes |
The atomic mass of an element listed in the Periodic Table represents the average mass of a single atom of that element and is measured in atomic mass units (amu). This number is an average as some elements have isotopes with atoms that vary in their number of neturons and, therefore, differ in weight.