Members of the ____ subphylum are now all extinct, but they were extremely numerous in shallow Paleozoic seas
Most of them were dorsoventrally flattened and heavily armored, with two deep longitudinal grooves that gave their body
a three-lobed appearance.
a. Myriapoda
b. Trilobita
c. Chelicerata
d. Hexapoda
e. Crustacea
ANSWER: b
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Deficiencies of which two minerals may result in muscular weakness?
a. iron and copper b. iron and manganese c. iodine and iron d. phosphorus and calcium e. phosphorus and potassium
The somatic senses include all EXCEPT which one
of the following sensations? a. balance b. pain near the body surface c. temperature d. touch e. pressure
Periderm is produced by:
a. xylem. b. cork cambium. c. pith. d. cortex. e. phloem.
Which lineage of Echinoderms is made up of about 1500 species of sea cucumbers, which are elongated along their oral-aboral axis?
a. Crinoidea b. Holothuroidea c. Echinoidea d. Asteroidea