How does acid in stomach defend the body against infection

What is the lowest output value approached by the function f(x)=2x−5?

Needed fast 15 points the process of natural selection favors certain characteristics in organisms, while it selects against other characteristics. what would happen if there was zero variation between all of the organisms on earth? a.organisms would evolve to increase variety b.natural selection would operate faster c.less food would be available d.evolution through natural selection would not occur

Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false