Which of the following best describes meiosis?

It is carried out in all tissues that require cell replacement
It occurs only in cells in the reproductive structures of an organism
It happens in all of the tissues except the brain and spinal cord
It is the first stage of mitosis

Ineed the definitions of all of these words nasap i will give 1o points to whoever awnsers

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

Does the sun release radiant energy?