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

Biology & Microbiology

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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.

Biology & Microbiology

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?

Biology & Microbiology

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.

Biology & Microbiology

Stamens, sepals, petals, carpels, and pinecone scales are all _____

A) female reproductive parts B) capable of photosynthesis C) modified leaves D) found on flowers

Biology & Microbiology