In summer, a(n) ____________________ prevents upper and lower waters from mixing, causing low oxygen content in deeper waters.
Fill in the blank(s) with the appropriate word(s).
thermocline
Biology & Microbiology
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The presence of a group of antigens that determine blood type is an example of a(n) ____________
A. semilethal allele B. sex-linked trait C. multiple allele system D. incomplete dominance
Biology & Microbiology
The enzyme nitrogenase is most directly involved in the process called ____
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
Biology & Microbiology
Which of the following female organisms do
NOT contain XX chromosomes?
a. humans b. fruit flies c. cows d. butterflies e. cats
Biology & Microbiology
What percentage of insects species are phytophagous (feed on plants)?
a. About 10% b. About 20% c. About 30% d. About 50%
Biology & Microbiology