Birds produce species-specific songs
Indicate whether the statement is true or false
TRUE
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The _______ definition of species says that a species is a group of organisms that are reproductively isolated from other such groups.
Fill in the blank(s) with the appropriate word(s).
Arrange the steps of antibody-mediated immunity in the proper order
1. Plasma cells secrete antibodies. 2. Helper T cells interact with B cells displaying the same antigen-MHC complex. 3. Contact with antigen. 4. Clones of B cells produced. 5. Fragmentation of antigen.
a. 3, 2, 5, 1, 4 b. 3, 5, 2, 4, 1 c. 1, 3, 5, 2, 4 d. 4, 3, 2, 1, 5 e. 5, 3, 4, 2, 1
Those organisms that cannot swim against the ocean currents are collectively called:
a. plankton. b. nekton. c. seston. d. demersal. e. infauna.
Virulence refers to the degree of pathogenicity manifested by a microbe, not simply whether or not it causes disease.
Answer the following statement true (T) or false (F)