| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.53 |
| Score | 0% | 71% |
A biological community of interacting organisms and their physical environment is known as:
community |
|
biome |
|
population |
|
ecosystem |
An ecosystem is a biological community of interacting organisms and their physical environment. This includes both the biotic (living) and abiotic (non-living).
The formula for acceleration is which of the following?
\(\vec{a} = \vec{F} m\) |
|
\(\vec{a} = { \vec{F} \over m }\) |
|
\(\vec{a} = { m \over F }\) |
|
\(\vec{a} = { m \over \vec{F} }\) |
Newton's second law of motion leads to the formula for acceleration which is a measure of the rate of change of velocity per unit time and, if you solve for positive acceleration, reveals how much net force is needed to overcome an object's mass. The formula for acceleration is \(\vec{a} = { \vec{F} \over m }\) or, solving for force, \(\vec{F} = m\vec{a}\).
Which of the following states of matter exists at the lowest temperature?
solid |
|
liquid |
|
none of these |
|
gas |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
When light travels between two substances it bends. This is called:
conduction |
|
convection |
|
refraction |
|
reflection |
Because different materials have different refractive indices, light changes speed when passing from one material to another. This causes the light to bend (refraction) at an angle that depends on the change in refractive index between the materials. The greater the difference, the higher the angle of refraction.
Herbivores are __________ that subsist on producers like plants and fungus.
primary consumers |
|
tertiary consumers |
|
secondary consumers |
|
scavengers |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.