| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.20 |
| Score | 0% | 64% |
The __________ is a system of muscles that allows breathing.
trachea |
|
diaphragm |
|
pulmonary |
|
bronchioles |
The diaphragm is a system of muscles that allows breathing. During inhalation, the diaphragm expands and air rushes in to fill the space created. Then, during exhalation, the diaphragm contracts and forces the air back out.
Which of the following is true about species groups?
a population is made up of a group of communities |
|
an ecosystem is a biological population |
|
a community is made up of a group of populations |
|
a biome is a made up of a group of biospheres |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
reactants |
|
side effects |
|
results |
|
products |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
212°F is how many °C?
100 |
|
\(135 {5 \over 9}\) |
|
0 |
|
-100 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (212 - 32)\)
\(C° = {5 \over 9} (180) = {{180 \times 5} \over 9}\)
\(C° = {900 \over 9}\)
\(C° = 100\)
Which of the following is not true about simple magnets?
opposite poles attract each other |
|
same poles repel each other |
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opposite poles repel each other |
|
all of these are untrue |
Simple magnets have two poles, north and south, and opposite poles attract each other (N attracts S, S attracts N). Likewise, the same pole of two magnets repel (N repels N, S repels S). The Earth has a magnetic field and North and South Poles which enables the use of a magnetic compass to determine direction.