| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
Which of the following describes the Earth's mantle?
solid |
|
primarily solid |
|
liquid |
|
primarily liquid |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.
Leafy vegetables, beans, potatoes, fruits, and whole grains are good sources of:
fiber |
|
protein |
|
saturated fat |
|
unsaturated fat |
Fiber provides bulk to help the large intestine carry away waste. Good sources of fiber are leafy vegetables, beans, potatoes, fruits, and whole grains.
A __________ is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound.
ion |
|
molecule |
|
isotope |
|
neutron |
A molecule is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound. The molecules of elements consist of two or more similar atoms, the molecules of compounds consist of two or more different atoms.
Which of these represents the path of blood flow through the heart?
right atrium → right ventricle → lungs → left atrium → left ventricle |
|
left atrium → right ventricle → lungs → left atrium → right ventricle |
|
right atrium → left ventricle → lungs → left atrium → right ventricle |
|
left atrium → left ventricle → lungs → right atrium → right ventricle |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.
What part of the nervous system controls simple reflexes?
autonomic |
|
spinal cord |
|
cerebrum |
|
medulla |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.