| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
When two air masses meet and neither is displaced, what kind of front is present?
stationary |
|
cold |
|
occluded |
|
warm |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
The two heart chambers that collect blood are called:
ventricles |
|
aorta |
|
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.
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
|
day and night cycle |
|
the northern lights |
|
tides |
Tides are caused by the gravitational interaction of Earth and the Moon.
Which of the following is the smallest component of an element that still retains the properties of the element?
atom |
|
element |
|
neutron |
|
molecule |
An atom is the smallest component of an element that still retains the properties of the element.
Gametes have how many pairs of chromosomes?
46 |
|
23 |
|
2 |
|
4 |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.