Which species of cyanobacteria is sold commercially?
a. E. Coli
b. Salmonella
c. Lactobacillus
d. Spirulina
e. Rhizobium
d
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Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
Four of the five choices listed below are threats to
species survival. Select the exception. a. habitat loss b. introduction of exotic species c. overharvesting d. illegal wildlife trading e. strip logging
Natural selection acts on ________, and ________ evolve
A) individuals; individuals B) individuals; populations C) populations; populations D) populations; individuals
For a plant to initiate chemical responses to herbivory, before it is directly affected by herbivores, _____
A) a plant must have already flowered at least once B) volatile "signal" compounds must be perceived C) gene-for-gene intraspecific recognition must occur D) phytoalexins must be released