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Sharpening a pencil and tearing a paper are examples of physical changes. Why?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
After a year, a pond containing a turtle, trout, sunfish, and a tadpole dries up, what organism in the pond ecosystem is able to take in oxygen?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
Which is the first step in a design process?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
A student places a ball on the ground and kicks it, why does it move?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
An air hose extends above and below the surface of the water. Which statement explains why the hose would look broken?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
In the winter, the pond starts to freeze. The ducks leave the pond. They migrate to warmer climates. Why?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
Which organism uses sunlight to produce food that others eat?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
Which organism in the pond ecosystem completely changes its physical features and food source when it becomes an adult?
butterfly
There is a change in the appearance of the objects
The ducks have difficulty finding food.
The kick applies a contact force to the ball
Light is refracted as it moves from air to water.
describe the problem
green algae
turtle
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