Why are antibiotics unhelpful for treating the common cold? O A. Bacteria are not killed by antibiotics.
O B. Colds are caused by antibiotics.
O c. Antibiotics cannot treat illnesses.
O D. Colds are caused by viruses.

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

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.

_is a product of the first stage of photosynthesis.atpglucosecarbon dioxidewater