Which BEST describes why autotrophs begin every food chain? (A) There are more of them than primary consumers. (B) They are the only trophic level that can use the sun's energy to create glucose. (C) They get their nutrients from detritivores and decomposers. (D) They can reproduce faster than consumers.

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

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