Relative dating uses _________ to estimate how old a fossil is.

A. radioactive isotopes
B. a molecular clock
C. structural features
D. depth within rock layers
E. embryonic structures


Answer: D. depth within rock layers

Biology & Microbiology

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Which structure present in the moss life cycle is diploid?

A. Archegonia B. Spore C. Gametophyte D. Protonema E. Zygote

Biology & Microbiology

A nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed

A. enriched. B. synthetic. C. reducing. D. enumeration. E. complex.

Biology & Microbiology

The grouping or classification of species is termed

A. kingdom. B. taxonomy. C. genus.

Biology & Microbiology

Most mycoses are difficult to treat because

A) many fungi have developed resistance antifungal agents. B) fungicides are rapidly metabolized by the liver. C) fungal cells provide few targets for selective toxicity. D) treatment causes major disruption of the microbiota. E) fungicides are extremely expensive.

Biology & Microbiology