The two most important factors that appear to have been involved in past mass extinctions are:a
fire and climatic factors.
b. disease and parasites.
c. glaciers and earthquakes.
d. environmental and biological factors.
e. plate tectonics and climatic factors
D
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Which protein is responsible for the ability of flu virus to bind to epithelial cells?
A. capsid protein B. hemagglutinin C. CD4 D. major histocompatibility factor
A production/respiration ratio of one indicates:
a. the reef is productive and exporting nutrients. b. little biomass is available for export. c. the reef may begin to decline. d. community respiration is too high. e. algae are overgrowing the coral.
Choose the statement that is TRUE.
a. Most digestion occurs in the stomach. b. Most of the fluid absorbed by the gut is absorbed by the large intestine. c. Cells in the stomach wall include muscle cells, neurons, endocrine cells, acid-secreting cells, and mucous-secreting cells. d. The liver secretes acidic bile.
An Rh-positive baby can cause an Rh-negative mother to produce antibodies against the Rh antigen. When is this a problem?
What will be an ideal response?