What is a characteristic of most fish in the clade Osteichthyes?
a. ossified skeleton
b. longitudinal nerve cords
c. cartilaginous skeleton
d. cutaneous respiration
a. ossified skeleton
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Isolates from CSF that are gram-negative coccobacilli, grow on chocolate agar in CO2 but not blood agar, require factor V but not X, and are nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. H. influenzae. c. H. aphrophilus. d. H. ducreyi.
Roughly a quarter of all known species are currently threatened with extinction. What is the primary source of this threat?
What will be an ideal response?
Individuals in the population grouped
according to levels of maturity define the population's a. carrying capacity. b. age structure. c. density. d. size. e. birth rate.
Stamens, sepals, petals, carpels, and pinecone scales are all _____
A) female reproductive parts B) capable of photosynthesis C) modified leaves D) found on flowers