Secondary succession is likely to occur in
a. a burned forest.
b. a shallow lake.
c. an abandoned field.
d. a burned forest and a shallow lake.
e. a burned forest, a shallow lake, and an
abandoned field
E
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Available evidence is consistent with the proposal that prion diseases are caused by infectious proteins.
Answer the following statement true (T) or false (F)
The antibody-mediated immune response is
most effective against
a. cancer cells. b. viral infected cells. c. bacteria circulating in the blood. d. viral infected cells and cancer cells. e. bacteria circulating in the blood and viral infected cells
White blood cells engulf bacteria using _____
A) phagocytosis B) pinocytosis C) osmosis D) receptor-mediated exocytosis
If you live on a river delta or coastline, you may not be able to eat the local shellfish because of high levels of toxins, even though you may be able to drink the water taken from the same source. Why?
A. Shellfish filter-feed and concentrate the dilute pollutants from the water, thus acting as early warning indicators of severe pollution. B. Shellfish regularly consume poisonous red tide organisms. C. Shellfish seasonally produce toxic substances. D. Most harmless native clams have been replaced by bad species.