If there are 20 Earthworms in a garden that covers 5 square meters, what is the population density of the earthworms?

A. 20 Earthworms

B. 4

C. 100 Earthworms per square meter

D. 4 Earthworms per square meter

Which of these have an elliptical orbit around the sun? A. Earth B. Jupiter C. Mars D. All of the above

Earth and all of the air in the atmosphere around it make up an incredibly complex system. Energy is constantly changing forms in many different ways.

Suppose that the Sun were to collapse from its current radius of about 700,000 km to a radius of only about 6000 km (about the radius of Earth). What would you expect to happen as a result?

Which statements describe intensity? Check all that apply. Intensity is the amount of energy that flows in an area per unit of time. Intensity is the number of wavelengths that flow in an area per unit of time.

You are on a cruise ship traveling north at a speed of 13 m/s with respect to land. 1) if you walk north toward the front of the ship, with a speed of 2.8 with respect to the ship, what is your velocity with respect to the land

Sara, who weighs 66 kg, is on a guilt trip after eating a 788-Calorie (788 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. She decides to work out before going to her weekly weight-watchers' meeting.

Can you get sunburned through glass?

Which statement about a signal transduction pathway is true? a. A signal transduction pathway provides a means for a signal molecule to pass through the cell membrane and initiate a chain of events inside the cell. b.

If a car is traveling on the highway at a constant velocity, the force that pushes the car forward must be A. greater than the force of friction exerted upon the car. B. less than the force of friction exerted upon the car. C.

Tom stops using a new skin cream for five days to determine if the cream is the cause of a recent rash. What stage of the scientific method is Tom using?