It is a concern that avian flu could become a _____ with cases spread around multiple continents
Fill in the blank(s) with the appropriate word(s).
pandemic
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A relationship between two species in which both species benefit is called ________
Fill in the blank(s) with correct word
Fossil stromatolites are evidence that cells exited 3.5 million years ago
_____________ Indicate whether the statement is true or false.
Your friend was diagnosed with strep throat 2 months ago. She was treated with antibiotics for 10 days, but two weeks after treatment, the symptoms returned
She was given a different antibiotic and her symptoms improved again, initially, but then got worse. What is happening? A) Your friend has taken antibiotics so long that she has become tolerant to them, making them ineffective. B) Exposure to antibiotics has caused each individual bacterial cell to evolve resistance to the antibiotics. C) Your friend was originally infected with some bacteria that were resistant to these two antibiotics and the bacteria multiplied. D) Your friend probably doesn't have a bacterial infection. There must be some other reason for her symptoms.
The structural level of a protein that is LEAST affected by a disruption in hydrogen bonding is the
A. primary level B. tertiary level C. quaternary level D. secondary level