What is the term for immunity gained by the transfer of antibodies across the placental barrier?
A. passive immunity
B. acquired immunity
C. humoral immunity
D. cell-mediated immunity
E. auto immunity
A. passive immunity
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Although the domain Archaea contains many acidophilic organisms, there are still many others within the domain that grow well in environments with a neutral pH
Indicate whether the statement is true or false.
Birds have
A. a backcurrent lung. B. an air sac lung. C. a parabronchial lung. D. a negative pressure lung. E. a tracheal lung.
The density of a population is defined as______
a. the number of individuals in a population at a specified time b. the number of individuals in a population at a specified place c. the number of individuals per unit area or per unit volume of habitat d. the size of the individual organisms per unit area e. the number of the individual organisms per unit size of each individual
A water-vascular system that operates the tube
feet is characteristic of the
a. arthropods. b. annelids. c. chordates. d. mollusks. e. echinoderms