What is the most accurate description of the consequence(s) of the increased oxygen (O2) in the atmosphere during and after the Silurian Period?
A. Conquest of land by arthropods.
B. Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
C. Increases in animal body sizes and appearance of shelled organisms.
D. Conquest of land by arthropods and vertebrates.
E. Conquest of land by arthropods and vertebrates, and plants.
Answer: B
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Inflammation is a nonspecific defensive reaction to a tissue injury.
Answer the following statement true (T) or false (F)
Embryonic endoderm gives rise to:
a. muscle. b. the lining of the digestive tract. c. the nervous system. d. skin. e. skeletal tissue
A scientific name consists of which of the following? I. Family name II. Genus name III. Species name
A. I only B. II only C. III only D. I and II E. II and III
The contribution of B-cells is mainly in
A. inflammation. B. complement activity. C. humoral immunity. D. phagocytosis. E. cell-mediated immunity.