Which muscle separates the thorax and abdomen and aids in breathing? a. pectoral b. intercostal c. diaphragm d. sternum

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Is dna the same in every cell in the human body explain your answer

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit