In what groups of vertebrates can you find internal fertilization? (Select all correct choices.)
A. mammals
B. reptiles
C. birds
D. fish
E. frogs
A,B,C,D
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__________ are antigen-presenting cells in the immune system
a. Natural killer cells b. Plasma cells c. Macrophages d. T helper cells e. Cytotoxic T cells
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a) cancogenes b) transformer genes c) ongogenes d) tumor enhancer genes e) haplogenes
When is knowing the host and environmental factors that lead to a disease more important to saving lives than knowing the etiological causative agent?
A) when the host range is very large B) when the disease is spread through sexual contact C) when there is no cure for the disease D) when specific health factors within a person's control are particularly risky E) when the source of infection is a particular geographical location