| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
As part of digestion, the liver produces bile which breaks down:
fat |
|
sugars |
|
protein |
|
starches |
The liver produces bile which emulsifies (separates) fat.
In the water cycle, infiltration is most closely related to:
runoff |
|
oceans |
|
water table |
|
rivers |
The water then accumulates as runoff and eventually returns to bodies of water or is absorbed into the Earth (infiltration) and becomes part of the water table, an underground resevoir of fresh water.
Changes to an object's speed or direction of motion are caused by which of the following?
power |
|
kinetic energy |
|
a force |
|
work |
Force is applied to change an object's speed or direction of motion.
A human heart consists of how many chambers?
4 |
|
1 |
|
2 |
|
8 |
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.
Which of the following is related to the Cambrian Explosion?
first civilizations |
|
carbon dating |
|
fossil record |
|
extinction of dinosaurs |
The Cambrian period is one of the most significant geological time periods. Lasting about 53 million years, it marked a dramatic burst of changes in life on Earth known as the Cambrian Explosion. It is from this period that the majority of the history of life on Earth, as documented by fossils, is found. Called the fossil record, the layering of these mineralized imprints of organisms preserved in sedementary rock have allowed geologists to build a historical record of plant and animal life on Earth.