Dolphins (which are mammals) and sharks (which are fish) have stiff dorsal fins projecting from their backs that help them maneuver through water. These relationships of structures to each other are best described as
A) vestigial structures. B) homologous structures.
C) mutations. D) analogous structures.
D
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The semilunar valves prevent blood from moving:a
from the atria back into the veins. b. from the ventricles back into the atria. c. from the arteries back into the ventricles. d. moving backwards in the capillaries. e. moving backward in the arteries.
A(n) ________ is composed of a light-harvesting complex of chlorophyll pigments and an electron transport system
Fill in the blank(s) with correct word
Sulfonamides & trimethoprim act through which of the following mechanisms?
A. Inhibition of Protein Synthesis B. Inhibition of nucleotide synthesis C. Inhibition of DNA synthesis D. Disruption of Cell Wall E. Inhibition of mRNA synthesis
Describe the major taxonomic divisions of prokaryotic organisms
What will be an ideal response?