I'LL MARK BRAINLIEST PLZ HELP MEH I NEED IT RN what is a fossil fern providing evidence the continents once were joined (science)

Need in all of themmm only answer if you know pls

The key to stability is feedback between the reservoir and the fluxes into and/or out of the reservoir. assume that the rate of outflow from a reservoir depends on the size of the reservoir according to the following relationship: outflow rate= k x (size of reservoir), where k is a constant. a reservoir of water has a volume of 5000 liters, and the rate of outflow at steady state is 25 liters per minute. what is k? (give both the numerical value and its units.) what is the residence time? what is the relationship between k and the residence time?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.