Why do some biologists NOT consider reptiles to be a monophyletic group?
A) Birds are the direct descendants of some reptiles.
B) All reptiles do not reproduce sexually.
C) The ancestors of reptiles are the class Amphibia.
D) Reptiles, birds, amphibians, and fish appeared in the fossil record at approximately the same time.
E) Reptiles evolved independently at several different times in the past and from several different ancestral species.
A
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The ventral body cavities include
(a) the thoracic cavity. (b) the cranial cavity. (c) the abdominopelvic cavity. (d) both a and c.
Zn + 2H+ = Zn2+ + H2 is an example of a redox reaction. What is happening to the hydrogen ions during this reaction, in which a bond is formed between the two H atoms?
A. Oxidation reaction and acceptance of an electron. B. Reduction reaction and acceptance of an electron. C. Reduction reaction and donation of an electron. D. Oxidation reaction and donation of an electron.
A contractile vacuole is important to euglenoids for:
a. photosynthesis b. food storage c. excess water removal d. movement e. structure
You awaken to discover your alarm clock failed to ring. You just might be able to make it to class on time if you leave immediately (skip breakfast) and sprint to reach the lecture hall two blocks away
What energy source is most likely being used to fuel your activity? A) Fat B) Glycogen C) Phospholipid D) Cellulose E) Protein