Which embryonic structure ultimately forms the digestive tract?
A. archenteron
B. blastopore
C. blastocoel
D. notochord
E. convergence extension
A. archenteron
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In the diagram of a root tip shown above, the item labeled "5" is the
a. quiescent center. b. zone of cell division. c. zone of elongation. d. root cap. e. zone of maturation.
Which type of species are adapted to stable, predictable environments?
a. r-selected species b. s-selected species c. k-selected species d. j-selected species
Water flows over gills in the opposite direction of blood flow in a process known as
A) inhalation. B) respiration. C) diffusion. D) countercurrent exchange.
Which of the following proteins are required for target cells to interact with hormones?
A) Neurotransmitters B) Response proteins C) Receptors D) Cyclic adenosine monophosphates (AMPs) E) Neuromodulators