A moss begins to grow on a rock in an area that was previously uninhabited by life. This is an example of a:

-Pioneer species

-climax community

-Disturbance

-secondary succession

What is the relationship between the frequency and the pitch of a sound?

Two solid spheres of radius R made of the same type of steel are placed in contact. The magnitude of the gravitational force they exert on each other is F1.

Sarah, who lives in Australia notices that the length of the shadow of the flagpole is getting shorter every day when measured at noon.

How can a magnet be used to find direction

The formula for average speed can best be written as

Which of the following describes resistance force?

Ursa Minor contains the pole star, Polaris, and the asterism known as the Little Dipper. From most locations in the Northern Hemisphere, all of the stars in Ursa Minor are circumpolar.

What is an organism ability to maintain a steady internal condition called

What is the fundamental frequency of a particular medium?. a. the lowest frequency at which a standing wave is possible. b. the highest frequency at which s standing wave is possible

The distance from the inner core to the surface of the earth is about 5,200 kilometers. the large amount of material surrounding the inner core places tremendous pressure on it.