Why do plants not have a exsited before cyanobacteria started producing oxygen?

A dog walks with a speed of 1.5 m/s. How long will it take the dog to cross a yard of length 8 m?

What is the Law of Conservation of Energy? A) Energy cannot be created, but can be destroyed as it transforms. B) Energy can be created and destroyed as it converts to other forms.

You drop a ball at 27 feet high. How long will it take for the ball to hit the ground?

Who developed the atomic theory of matter? john dalton niels bohr marie curie ernest rutherford?

How many cells are in a grown person body

A wave has a wavelength of 7 mm and a frequency of 9 hertz. What is its speed?

Which statement best describes the effect of scientific advances on society? A. They always have a positive impact on society. B. They are inspired by the needs of society. C. they do not affect society beyond the community level. D.

Which is the best example of reusing? repairing a stove instead of buying a new one wearing a pair of pants made from cotton buying a toy packaged in paper instead of plastic placing a glass bottle in the recycling bin

The sunlight hits the surface of a lake this will like caused a. condensation b. transpiration c. evaporation d. sublimation

The development of the cell theory was mostly directly related to the