Mammals get rid of metabolic waste to retain homeostasis. The kidneys filter urea to retain water. This is called
A respiration
b circulation
c reproduction
d excretion

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

How does an angiosperm prevent self pollination

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.