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

Which is the fundmental law of energy?

Suppose a person has a small intestine that has fewer villi than normal. Would the person most likely be overweight or underweight? Explain.

the latest sunspot maximum occurred in 2001. Using the data from your sunspot-activity data table, predict the next sunspot minimum

How many electrons are in the third energy level

Which planet has an enormous storm called the Great Red Spot swirling in its atmosphere? a. Jupiter b. Saturn c. Uranus d. Neptune

What is the relationship between the mass and period in a mass hanging on spring oscillation and why?

Saturn's moon Titan has a mass of 1.35 * 1023 kg. If Titan is 1.19 * 106 km from Saturn, and Saturn's mass is 5.86 * 1026 kg, what is the gravitational force between Saturn and its moon? 2.76 * 104 N 3.29 * 107 N 3.73 * 1021 N 4.43 * 1030 N

What has occured when bubbles form in a liquid that is being heated

What would happen to the supply of ATP in your cells if you did not eat enough carbohydrates?

According to a rule-of-thumb, every 5 seconds, between a lightning flash and the following thunder gives the distance to the flash in miles.