| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.23 |
| Score | 0% | 65% |
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
kinetic |
|
gravitational |
|
potential |
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inherent |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
The Sun is a __________-type main-sequence star.
D |
|
G |
|
S |
|
E |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
__________ and __________ pair to strengthen bones.
vitamin D, calcium |
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vitamin D, magnesium |
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calcium, vitamin A |
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iron, calcium |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
What prevents blood pumped out of the ventricles from flowing back into the heart?
atria |
|
capillaries |
|
valves |
|
platelets |
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.
In cell biology, what part of the cell contains organelles?
cell wall |
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nucleus |
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cell membrane |
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cytoplasm |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles.