| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.06 |
| Score | 0% | 61% |
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
|
the northern lights |
|
day and night cycle |
|
tides |
Tides are caused by the gravitational interaction of Earth and the Moon.
When the clouds become too saturated with water, the water is released as precipitation in the form of:
snow |
|
snow or ice |
|
ice |
|
rain |
Rising into the atmosphere, the water condenses into clouds. When the clouds become too saturated with water, the water is released as snow or ice precipitation which may warm as it falls to reach Earth as rain.
What prevents blood pumped out of the ventricles from flowing back into the heart?
capillaries |
|
platelets |
|
atria |
|
valves |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
A biological community of interacting organisms and their physical environment is known as:
community |
|
population |
|
ecosystem |
|
biome |
An ecosystem is a biological community of interacting organisms and their physical environment. This includes both the biotic (living) and abiotic (non-living).
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
electron shells |
|
protons |
|
atomic mass units |
|
electrons |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.