Do divergent plate boundries have eath quakes

In which of the following relationships is one organism always benefited while the other organism is always harmed

What is the next step in muscle contraction after the actin changes shape

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.