The first simple, one-celled organisms that developed during the Precambrian era are called

How is clean, fresh water produced in nature

Select all that apply. which of the following astronomers supported the sun-centered system? tycho brahe johannes kepler copernicus ptolemy

A car traveling at 39 m/s starts to decelerate steadily. It comes to a complete stop in 9 seconds. What is its acceleration?

Determining wavelength An infrared wave traveling through a vacuum has a frequency of 4.0 1014 Hz. What is the wave's wavelength? 75 x 107 m 7.5 x 10-7m 12 x 1014 m 1.2 x 10-14 m

Two trains start from towns 240 mi apart and travel towards each other on parallel tracks. they pass each other 1.6 hr later. If one train travels 10 mph faster than the other, find the speed of each train ... ?

Which of the following is NOT a vector quantity? (A) Acceleration (B) Average velocity (C) Linear momentum (D) Potential energy (E) Force

Which of Newton's laws of motion is demonstrated by a hammer pounding a nail into a board

Heated air molecules in a hot air balloon soon carried thermal energy to the top of the balloon. this is an example of ... conduction. Convection. Radiation. Cooling.

When you are ice skating, to get started, you push your skate backwards on the ice and, as a result, begin to move forward. Which law of motion is being described in this scenario?

When attempting to solve a difficult problem, the best scientific approach would be to a. bring together a team of scientists with different backgrounds and perspectives to work together to find a solution to the problem. b.