Darwin’s primary contribution to biological theory was
a. the methods for estimating the age of fossils
b. the concept that organisms change over time and form new species
c. the mechanism by which mutations come about
d. the concept of gene pools and changes in allele frequencies
e. the mechanism by which populations of organisms change over time
E
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Which of the following components makes up the greatest percentage of blood volume?
a. Water b. Plasma proteins c. Platelets d. White blood cells e. Red blood cells
Which of the following time periods contains the others?
A. Cretaceous B. Mesozoic C. Triassic D. Jurassic
A student accidentally left a tube of nutrient broth inoculated with E. coli at 20°C for 96 hours and a tube of nutrient broth inoculated with E. coli at 37°C for 96 hours. Which tube would you expect to be in the death phase of its growth curve?
A) The tube incubated at 20°C B) The tube incubated at 37°C
Compound leaves
A. have palmate venation. B. are toothed at the edges. C. are alternately arranged. D. have a blade divided into leaflets. E. have two or more petioles per blade.