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

Suppose you mix food coloring in water to make it blue. Have you made a solution or a suspension?

True or false: It is colder in the winter in the Northern Hemisphere because Earth is farther from the sun then. Explain

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Which of the following is a predicted answer to a scientific question A. an experiment B. A Hypothesis C. an observation D. A Conclusion

Five moles of an ideal monatomic gas with an initial temperature of 121 ∘C expand and, in the process, absorb an amount of heat equal to 1200 J and do an amount of work equal to 2020 J. What is the final temperature of the gas?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?

In a nuclear power plant, the temperature of the water in the reactor is above 100°C because of what?

Determine the total mechanical energy of a 250 g baseball if it has a velocity of 30 m/s when it leaves the pitcher's hand 1.2m above the ground.