Which of the following is usually a primary carnivore?
a. chicken
b. cow
c. rabbit
d. lion
e. squirrel
D
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B cells interacting with helper T cells are stimulated to differentiate when _____
A) B cells produce IgE antibodies B) B cells release cytokines C) cytotoxic T cells present the class II MHC molecule-antigen complex on their surface D) helper T cells differentiate into cytotoxic T cells E) helper T cells release cytokines
Lymph capillaries are smaller in diameter than blood capillaries
Indicate whether the statement is true or false.
Variations in rates of growth for different parts of the body are referred to as:
a. allometric growth patterns. b. adaptive growth patterns. c. allopatric growth patterns. d. allopolyploidy. e. preadaptations
Gymnosperms were the dominant form of plant life on land:
A) before ferns evolved. B) about 20 million years ago. C) around the time the dinosaurs came to dominance. D) until the discovery of fire by humans.