Mammals are the only vertebrates to possess
A. single loop circulation.
B. hair.
C. live birth.
D. a four-chambered heart with a pulmonary circuit.
E. endothermy.
Answer: B
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A divergence from _____ gave rise to tetrapods
a. ray-finned fishes c. cartilaginous fishes b. lizards d. lobe-finned fishes
__________ is the arrival of pollen grains on a
receptive stigma. Fill in the blank(s) with the appropriate word(s).
Refer to the accompanying figure. Which protist group’s life cycle is demonstrated in this figure?
a. red algae
b. green algae
c. brown algae
d. dinoflagellates
e. foraminiferans
Please match the virulence factor of Streptococcus pyogenes to its description.
Capsule A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots D) Projecting surface antigen that facilitates adherence and resists phagocytosis E) Chemical surface layer that prevents an immune response by the host F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues