The iucn's red list is select one:
a. an updated list of species facing unusually high risk of extinction
b. a list of unidentified species
c. a list of ecologically damaged ecosystems
d. an identification list of known species
e. a scorecard of international failures at conservation

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

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 part of cellular respiration must occur before any of the other steps can occur