Lichens are most typically formed by the symbiotic association of an alga or cyanobacterium and a(n):
a. zygomycete.
b. ascomycete.
c. basidiomycete.
d. glomeromycete.
e. chytridiomycete.
d
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Researchers suggest that despite the trend observed, the depletion of oxygen from the atmosphere due to burning of fossil fuels is currently not a serious environmental concern
because the change in oxygen levels is small compared to the abundance of atmospheric oxygen, which is sufficient for survival of animals and humans. True or false. Severe declines in ocean plants (phytoplankton) due to ocean warming and acidification from dissolved CO2 (forming HCO3 - and CO3 2-) could potentially lead to larger decreases in O2 levels over time, thereby altering this conclusion. What will be an ideal response?
Infection within the subarachnoid space or throughout the pia mater and the arachnoid membrane is referred to as:
a. meningoencephalitis. b. aseptic meningitis. c. encephalitis. d. meningitis.
Dilation of blood vessels is regulated by the second messenger
A) cAMP. B) Ca2+. C) IP3. D) CO2. E) NO.
Which of the following is NOT an advantage of having an endoskeleton?
A. Endoskeleton provides protection to the internal organs. B. Endoskeletons can support the weight of a large animal. C. Endoskeletons provide protection for the outermost tissue layer of the organism. D. The skeleton grows with the animal. E. Endoskeletons allow for more flexibility.