Your neighbor tried to lift a propane tank onto the back of his pickup truck and ruptured the cartilaginous disk between two of his vertebrae. What is most likely to happen to him?
A) He will have bloody stools.
B) He will suffer pain from a compressed spinal nerve.
C) He might have severe brain damage.
D) His spinal nerve cord will enlarge.
B
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The _____ and _____ are unique among vertebrates (or craniates) in that they lack jaws
A. hagfish; lampreys B. hagfish; cephalochordates C. cephalochordates; lampreys D. lampreys; cartilaginous fish E. none of these
Respond to statements 103–107 with reference to the five terms
below. a. somites b. blastomeres c. ectoderm d. mesoderm e. endoderm M 103. This is the first primary tissue layer to form. E 104. It forms between the other two primary tissue layers. M 105. These are the source of most bones and the skeletal muscle of the head and trunk. M 106. These reorganize themselves into the gastrula. E 107. This starts the gut’s inner lining.
Greenhouse effect
What will be an ideal response?
The first four days of human embryonic development occur in the
A) uterus. B) vagina. C) cervix. D) oviduct. E) ovary.