| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.23 |
| Score | 0% | 65% |
Arteries carry __________ blood at __________ pressure.
oxygenated, low |
|
oxygenated, high |
|
deoxygenated, low |
|
deoxygenated, high |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
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.
molecule |
|
neutron |
|
ion |
|
isotope |
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.
In the food chain, omnivores may be which of the following?
secondary or tertiary consumers |
|
primary or secondary consumers |
|
primary or tertiary consumers |
|
secondary consumers or scavengers |
Secondary or tertiary consumers may be omnivores.
Which of the following is not a method of heat transfer?
reflection |
|
convection |
|
conduction |
|
radiation |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
|
power |
|
kinetic energy |
|
work |
Force is applied to change an object's speed or direction of motion.