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
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).
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