| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.98 |
| Score | 0% | 60% |
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.
__________ and __________ pair to strengthen bones.
vitamin D, magnesium |
|
vitamin D, calcium |
|
iron, calcium |
|
calcium, vitamin A |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
Which of the following describes the Earth's outer core?
liquid |
|
primarily solid |
|
solid |
|
makes up most of the Earth's volume |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
During digestion, after proteins are broken down where does the undigested food go next?
stomach |
|
small intestine |
|
large intestine |
|
esophagus |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
The hottest of Earth's atmospheric layers is which of the following?
troposphere |
|
thermosphere |
|
mesosphere |
|
stratosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.