Vertebrate locomotion results from the contraction of muscles anchored to what other tissue?
A. Bone
B. An exoskeleton
C. Nerves
D. Each other
E. The plasma membrane
Answer: A
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The coelom forms in two different ways. Which of the following statements best compares those ways?
A. In schizocoelous development a solid mass of mesoderm splits to form the coelom whereas in enterocoelous development a layer of mesoderm cells forms a pocket off of the developing gut to form the coelom. B. In enterocoelous development a solid mass of mesoderm splits to form the coelom whereas in schizocoelous development a layer of mesoderm cells forms a pocket off of the developing gut to form the coelom. C. In enterocoelous development the coelom forms inside the mesoderm whereas in schizocoelous development the coelom forms on the outside of the mesoderm. D. In schizocoelous development the coelom forms within the mesoderm whereas in enterocoelous development, no coelom is formed at all. E. Schizocoelous and enterocoelous both form the coelom in identical ways, the difference merely being that the term schizocoelous is used only for deuterostomes and enterocoelous is used only for protostomes.
Dim light causes the pigment ________ in rods to change shape, which causes sodium channels on the photoreceptor cell to close and activate ganglion cells
Fill in the blank(s) with correct word
reproductive isolation
What will be an ideal response?
What findings are consistent with an asteroid impact as a cause for the K–T mass extinctions?
a. Ammonites showed elevated extinction rates prior to 65 MYA. b. Dramatic pollen increases coinciding with the iridium spike in geological layers. c. Geological data suggest a period of global warming around 65 MYA. d. A decline in planktonic fossils around 65 MYA that is stronger but similar to a decline of ma-rine productivity caused by a historic volcanic eruption. e. B and D.