Archaeopteryx and the vulture below show a connection for what ? A. The extinction event of dinosaurs
B. The homologous structures which suggests a group of dinosaurs evolved the ability to fly and eventually evolved into modern day birds
C. the analogous structures of animals that have different origins but the same usage
D. the competition that existed between birds and reptiles during the permian

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

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry