What changes were necessary in earth's atmosphere to allow complex organism to evolve

A mango fruit drops from the top of it's tree which is 40 m. How long does it takes to reach the ground

Which variable is inversely related to force? A) Charge (q) B) Radius (r) C) k

A famous physics tale is about a rich man who was found dead. He was stuck in the middle of a frozen lake where the ice was completely frictionless, making it impossible to walk.

One of the best ways of insuring that we have a representative sample is to use a self-selected sample. True False

Using a wavelength laser, you form the diffraction pattern of a wide slit on a screen. You measure on the screen that the dark fringe is away from the center of the central maximum. How far is the screen located from the slit?

How does gravitational force and electric force compare?

There are two types of addiction, psychological and physical. A. True B. False

What two gases probably dominated precambrian earth's atmosphere?

a fast ball travels at about 161kilometers/hr if this fast ball could keep its speed how long would it take this ball to travel 0.15 terameters?

You are traveling upstream on a river at dusk. you see a buoy with the number 4 and a flashing red light. what should you do?