Which cell type is unique to vertebrates, and distinct from endoderm, mesoderm, and ectoderm?
a. pharyngeal
b. neural crest
c. oral hood
d. notochordal
e. cranial
ANSWER: b
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Roundworms have a true coelom
____________________ Indicate whether the statement is true or false.
A marine invertebrate placed into freshwater would have difficulty surviving because:a
it would not be able to obtain food. b. it would have difficulty with buoyancy. c. it would have difficulty with osmoregulation. d. it would not experience the temperature stability found in the oceans. e. it would not be able to obtain oxygen due to the absence of waves in the water.
In an unstimulated neuron, the ________ concentration is higher inside the cell than outside
A) K+ B) Ca2+ C) Li+ D) Cl? E) Na+
A diploid fertilized egg is called a(n) ________
Fill in the blank(s) with correct word