The figure below shows phenotypic measures for fossils that have been taxonomically classified as belonging to two different species. Which of the following scenarios are possible explanations for the observed pattern?
a. several extinction events (taxonomic classification underestimates number of species)
b. one extinction event (taxonomic classification matches the number of species)
c. no extinction event (taxonomic classification overestimates the number of species)
d. All of the above
D
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The Krebs cycle is believed to have developed fairly recently in the evolution of cellular life
A. true B. false
Which of the following is the highest (or most complex) level of structure for genetic material?
A. nucleotide B. double helix C. DNA D. gene E. chromosome
Small molecules can move between capillaries and interstitial fluid by _____
a. passive transport b. active transport c. endocytosis d. diffusion e. exocytosis
Under the biological species concept, what criterion is used to assign populations of organisms to the same biological species?
A) a very similar appearance
B) being able to interbreed and produce fertile offspring
C) responding to the environment in the same way
D) having 99% of their genes in common