At the end of the Permian period a large mass extinction occurred; 90-95% of the marine and terrestrial species were eliminated. Which of the following are thought to be the possible cause(s) of this mass extinction? Select all that apply.
_____ Glaciation.
_____ Volcanic eruptions.
_____ Meteorite collisions with Earth.
_____ Competition between marine and terrestrial species.
_____ Sudden drop in atmospheric O2.
__X__ Glaciation.
__X__ Volcanic eruptions.
_____ Meteorite collisions with Earth.
_____ Competition between marine and terrestrial species.
_____ Sudden drop in atmospheric O2.
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The units of genetic distance derived from bacterial conjugation studies are called _____
A. seconds B. map units C. centimorgans D. recombination units E. minutes
This is a tool that enables researchers to study the structure and function of cells.
A. magnifying glass B. microscope C. tunneling assay D. digital recording E. differential centrifugation
Normally in humans, all the sons of a male showing a sex-linked phenotype will inherit the trait
Indicate whether the statement is true or false
The antitoxin therapy for rattlesnake bite provides (artificial/innate/natural) immunity.
Fill in the blank(s) with the appropriate word(s).