Studies of the Pax6 gene and its homologs suggest that
A. the eye has evolved independently multiple times.
B. the eyes of many different species are descended from a common ancestor.
C. the master genes of the eye in various species are not homologous.
D. the simple eyes of invertebrates and complex eyes of vertebrates arose from two different ancestral control genes.
B. the eyes of many different species are descended from a common ancestor.
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Which of the following is considered an opportunistic pathogen?
A) Toxoplasma gondii B) Trichomoniasis vaginalis C) Candida albicans D) Plasmodium vivax
Ligaments connect what to what?
What will be an ideal response?
Which process involves the flow of heat between two matters that are in direct contact?
a. conduction b. evaporation c. convection d. radiation
The __________ of an infectious disease is the fraction of a population that contracts that disease during a particular time.
Fill in the blank(s) with the appropriate word(s).