The first amphibians appeared during the _____ period.
A. Silurian
B. Carboniferous
C. Cambrian
D. Devonian
E. Ordovician
D. Devonian
Biology & Microbiology
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Bacterial cultures with a large number of genetically identical cells are called:
a. clone cultures. b. equal cultures. c. simple cultures. d. identical cultures. e. fresh cultures.
Biology & Microbiology
To meet the high oxygen demands of flight,
birds
a. use simple lungs. b. use air sacs connected to their lungs. c. use carbon dioxide for respiration. d. can diffuse oxygen through their skin. e. use simple lungs, and can diffuse oxygen through their skin.
Biology & Microbiology
What are biosensors and how are they used?
What will be an ideal response?
Biology & Microbiology
How do nonsteroid hormones differ from steroid hormones?
What will be an ideal response?
Biology & Microbiology