Which types of fish have gill slits hidden beneath a gill cover?
a. jawless fishes
b. cartilagenous fishes
c. bony fishes
d. sharks and rays
e. lampreys and hagfish
c
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Place the following cell types in the correct order during the differentiation of a hematopoetic stem cell (HSC) into a macrophage. Some may be used once or not at all.
I. megakaryocyte II. lymphoid progenitor III. macrophage IV. hematopoetic progenitor V. myeloid progenitor VI. monocyte VII. hematopoetic stem cell A. VII, IV, V, VI, III B. IV, VII, V, VI, III C. IV, VII, II, VI, III D. VII, IV, V, II, III E. VII, IV, II, IV, III
Why is innate host resistance a type of nonspecific immune response?
A. Innate resistance is nonspecific because it depends on the life experience of the individual, for example, receiving a vaccine or acquiring a disease due to a particular pathogen. B. Innate resistance is nonspecific because any foreign material, microorganisms, or antigens encountered by the host are targeted. C. Innate resistance is nonspecific because any type of immune response, such as inflammation, phagocytosis, or humoral immunity, is activated in the host by foreign material. D. Innate resistance is nonspecific because it is impossible to determine the specific degree by which any host will respond when foreign material or microorganisms are present.
Water covers about ____ of Earth's surface.
A. 33% B. 40% C. 50% D. 70% E. 80%
What is it called when water molecules dissociate due to interaction with radiation?
a) Point mutation b) Anabolism c) Ionization d) Radiolysis