An impulse that travels inward from a sensory receptor to the spinal cord, then outward to a muscle is called a(n) a. inhibitory potential b. excitatory potential c. sensory-motor arc d. reflex arc

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

1. beginning with all chambers of the heart in the "relaxed" phase, describe the cardiac cycle in mammals, with systole and diastole of the atria and ventricles. for each time point in the cycle you select, state the following: • whether the atria and ventricles are contracting or relaxing • whether the av valves and semilunar valves are closed or open • whether the pressure in the atria and ventricles is high or low