Consider the phylogeny below. Why did Lutzoni and Pagel suggest that fungal species involved in mutualistic relationships with algae (dark grey branches) or liverworts (light grey branches) evolve faster than free-living fungi (black branches)?
a. Branch lengths for mutualistic taxa are on average longer than for free-living taxa.
b. The phylogeny does not reveal any clues about evolutionary speed; separate tests were neces-sary.
c. We cannot tell because there is only one independent comparison between mutualistic and free-living taxa.
d. B and C.
A
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A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A
In humans, the structure in which T lymphocytes mature is called the ____________
A. thymus B. bone marrow C. lymph node D. bursa of fabricus
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Fill in the blank(s) with correct word