4. Identify the ECG wave (P, QRS, or 'T) described in each of the following: Atrial depolarization
Depolarization wave travels from the SA node to the AV node
Depolarization wave travels along the AV bundle, the bundle branches, and up the Purkinje fibers
QVentricular depolarization
Ventricular repolarization
Causes atria to contract
Causes ventricles to contract
Atria empty
Atria fill
Ventricles empty
Ventricles fill

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

What causes the phospholipids to organize themselves the way they do

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote