Which issue is least likely to have been the result of human impact on the nitrogen cycle?
a. photochemical smog
b. global warming
c. acid rain
d. El Niño-Southern Oscillation events
e. depletion of the ozone layer
d
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The gymnosperm group with the fewest species is phylum:a
Coniferophyta. b. Ginkgophyta. c. Cycadophyta. d. Gnetophyta. e. Pteridophyta.
You sample a population of butterflies and find that 56% are heterozygous at a particular locus. What should be the frequency of the recessive allele in this population?
A) 0.08 B) 0.09 C) 0.70 D) Allele frequency cannot be determined from this information.
Smooth ER has several functions including regulating ___________ levels in muscle cells, breaking down _____________ in liver cells, making membrane lipids called __________, and producing steroid ____________, in the ovaries and testes.
Fill in the blank(s) with the appropriate word(s).
Ferns and flowering plants belong to the clade ________
Fill in the blank(s) with correct word