Fine, wet crackling sounds usually caused by closed alveoli popping open when enough air pressure is applied. fluid in the lungs squeezes alveoli closed, making them unavailable for gas exchange until they can be forced open
a) true
b) false

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.