Explain why today's estimate of the number of species present on Earth is so uncertain.
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Q29: In North America,many kinds of birds have
Q30: New genetic traits upon which natural selection
Q31: A small flock of birds becomes stranded
Q32: Species richness is affected by many variables.As
Q33: Antibiotic resistance can occur when_ .
A)bacteria populations
Q34: Biodiversity enhances human food security because_ .
A)drugs
Q35: Endemic species are_ .
A)well established and show
Q36: Biologists define a region as a biodiversity
Q37: The causes of the sixth mass extinction
Q39: Genes are located on molecules called_ .
A)nuclei
B)deoxyribonucleic
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