The notochord induces the neural plate Indicate whether the statement is true or false
True
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Why is high blood pressure damaging to the kidneys? What will be an ideal response?
The most fit individuals tend to leave the fewest fertile offspring.
a. true b. false
What kind of organisms likely perished due to the increase of oxygen in the atmosphere three billion years ago?
a. heterotrophs b. cyanobacteria c. obligate aerobes d. obligate anaerobes e. facultative anaerobes
Standing still and at attention for long periods can result in inadequate venous return. The effects of this can be seen when even young and healthy soldiers sometimes faint when standing at attention for long periods. Which of the following is NOT occurring to promote return of blood from the venous system in this situation?
A. one way flow in the venous system due to valves B. sympathetic activation of smooth muscle in large veins C. skeletal muscle activity compressing veins and forcing blood flow D. ventricular contraction