Complete reproductive isolation is evidence that
what has occurred?
a. extinction
b. speciation
c. polyploidy
d. hybridization
e. gene flow
Answer: b
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Members of the ____ subphylum are mostly insects and were among the first animals to colonize terrestrial habitats
a. Myriapoda b. Trilobita
c. Chelicerata d. Hexapoda e. Crustacea
The letter "C" in the accompanying figure represents the ____ plane
a. transverse b. radial c. tangential d. elliptical e. obtuse
During a muscle contraction, electrical impulses travel to the interior of the cell through ____
a. T-tubules b. endoplasmic reticulum c. troponin d. tropomyosin e. sarcoplasmic reticulum
How do fungi obtain nutrients?
A) through photosynthesis B) by secreting chemicals that break down food and then absorbing it C) by secreting antibiotics and then absorbing killed bacteria D) by engulfing bacteria directly