Which statement is true about predictions made from the theory of common descent?
A) They are almost always supported when they can be tested.
B) They cannot be tested and thus we cannot know if they are correct.
C) They are supported and not supported by experimental evidence with equal frequency.
D) They are supported by experimental evidence for all organisms except humans.
A
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The function of heart valves is to ____
a. form blood cells b. participate in immunity c. prevent backflow of blood d. prevent clot formation e. push blood into the aorta
Knoblike sacs where the inner colon lining protrudes through the intestinal wall are called
a. diverticula. b. ulcers. c. haustra d. sphincters. e. appendices.
You discover a butterfly that has some similarity to members of the species Faunis canens, but it also has a few important differences. What taxonomic level would best describe your new discovery?
A) order B) family C) species D) genus
What type of growth does a plant exhibit when its trunk gets thicker?
A) primary B) secondary C) tertiary D) determinate