The characteristic that separates cartilaginous fishes from lampreys is
A) jaws.
B) four-chambered hearts.
C) bony skeletons.
D) sucker-like mouths lined with teeth.
E) lungs supplemented by air sacs.
A
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Select the diseases caused by trypanosomes.
A. Leishmaniasis B. Giardiasis C. Trichomoniasis D. African Sleeping Sickness E. Chagas Disease
A metaphase plate forms in both plant and animal cells and is when the chromosomes __________. Fill in the blank(s) with the appropriate word(s)
A nonprofit conservation organization receives a sizeable donation and decides to purchase several thousand acres of "high desert" in southern California. This particular type of desert has an intermediate level of species diversity and few unique species. However, much of the original areas of high desert have been converted to suburban housing and shopping. The decision by the nonprofit to preserve this area was most likely based upon what conservation strategy?
A. Conservation of endemic species hotspots B. Conservation of megadiverse areas C. Conservation of representative habitats D. Conservation of single species
Sympatric speciation commonly occurs through ________ in plants but is more likely to occur through ________ in animals
A) polyploidy; habitat differentiation and sexual selection B) habitat differentiation and sexual selection; polyploidy C) asexual reproduction; chromosome duplications D) self-pollination; polyploidy and other genetic mechanisms