Some of the earliest animals to successfully adapt to life on land were the:
A) arthropods. B) amphibians.
C) trilobites. D) aquatic vertebrates.
Answer: A
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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. sympathetic activation of smooth muscle in large veins B. skeletal muscle activity compressing veins and forcing blood flow C. one way flow in the venous system due to valves D. ventricular contraction
The algal ancestors of land plants are most likely similar to the ____
a. Rhodophyta b. Phaeophyta c. Chrysophyta d. Charophyta e. Radiolaria
Undifferentiated cells that can divide and specialize to form a variety of different cells are called:a
differential cells. b. mother cells. c. somatic cells. d. stem cells. e. morphogens
Which of the following methods of preserving food sterilizes it?
A) canning B) pasteurization C) drying D) gamma radiation E) lyophilization