What is a disease's immunity threshold?
What will be an ideal response?
Ans: Minimum percentage of immune individuals a community needs to prevent an outbreak
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Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem c. the concentration of nondegradable poisons within organisms at higher trophic levels d. the concentration of degradable poisons within organisms at lower trophic levels e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared to those at lower trophic levels
Which of the following does NOT occur in the first
trimester during human development? a. formation of a heart b. disappearance of the tail c. formation of internal organs d. detection of movement of the fetus e. segmentation and development of somites
Carbohydrates that add to our caloric intake but meet no other nutritional needs are
a. refined sugars. b. starches. c. celluloses. d. sugar alcohols. e. artificial sweeteners
The classification scheme of Linnaeus was originally based on __________, but has now been altered
to reflect __________. a. similarities; structural differences b. biodiversity; structural similarity c. evolutionary history; structural similarity d. similarities; evolutionary history e. differences; similarities