El Niño-Southern Oscillation has resulted in:
a. global weather changes.
b. increases in the fish populations off South America.
c. cooling of surface waters of the East Pacific.
d. upwelling in many places.
e. global warming.
A
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When fat enters the duodenum, it stimulates release of ____
a. amylase b. cholecystokinin c. gastrin d. secretin e. trypsin
In a biology lab you are given a lancelet to dissect. During the dissection you observe a flexible rod of nerve cells, extending along its back to its tail. Based on this observation, you can place it in the phylum
A. Chordata. B. Arthropoda. C. Cnidaria. D. Echinodermata. E. Nematoda.
If you swim underwater for 200 yards you would expect:a
the of the air in the alveoli to increase. b. the in the tissues to increase. c. the of the air in the alveoli to decrease. d. the in the tissues to increase. e. the of the air in the alveoli to increase and the in the tissues to increase.
At some point in their lives, all chordates have:
A) jaws. B) a brain. C) a ventral nerve cord. D) gills. E) a dorsal nerve cord.