The most direct ancestors of land plants were probably . A. green algae B. kelp (brown alga) that formed large beds near the shorelines C. photosynthesizing prokaryotes (cyanobacteria) D. liverworts and mosses

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

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

What element is able to combine with itself and hydrogen to form large molecules ?