If cyanobacteria had failed to appear on earth, how would the evolution of earth's atmosphere most likely be different

Suppose that recording station n is located 200 km north of the epicenter of an earthquake, and recording station s is located 100 km south of the epicenter of the same earthquake. which of the following statements would be true?

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and

What is a subatomic particle with a negative charge and very little mass?