Which lineage shared several derived traits—such as the shapes and positions of bones in their appendages—with early tetrapods, and apparently gave rise to the tetrapods?
a. osteolepiforms
b. acanthodians
c. ostracoderms
d. conodonts
Ans: a. osteolepiforms
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Where in the body does the circadian clock act to control of vascular disease?
a. Systems under positive feedback control. b. Systems under negative feedback control. c. Systems that develop early in life. d. Systems that develop later in life. e. It is not known.
__________ is a field of study concerned with the origins, evolution, and persistence of life on Earth as it relates to
life in the universe. Fill in the blank(s) with the appropriate word(s).
The classic Hershey and Chase (1952 ) experiment that offered evidence in support of DNA being the genetic material in bacteriophages made use of which of the following labeled component(s)?
A) tritium B) hydrogen C) nitrogen and oxygen D) phosphorus and sulfur E) None of the answers listed is correct.
Which of the following is not a reason we become shorter as we age?
a. As a person ages, the intervertebral discs become thinner and the vertebrae will be stacked closer together, resulting in shorter stature. b. As a person ages, vertebral bodies lose bone mass (osteoporosis) resulting in smaller vertebrae that stack closer together. c. As a person ages, scoliosis may develop resulting in an abnormal spinal curvature and shorter stature. d. As a person ages, the ligaments connecting vertebrae together are weakened, resulting in a more pronounced kyphosis. This posterior curvature of the spine lowers the skull, making you shorter.