When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)

A. single covalent bond.
B. double covalent bond.
C. triple covalent bond.
D. ionic bond.
E. hydrogen bond.


B. double covalent bond.

Biology & Microbiology

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The region of the large intestine that when stretched stimulates the defecation reflex and allows for the passage of feces.

A) Large intestine B) Stomach C) Esophageal cancer D) Appendix E) Mouth F) Salivary glands G) Rectum H) Cirrhosis I) Gallbladder J) Small intestine

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Seed germination is stimulated by:

A. red light. B. far-red light. C. blue light. D. green light. E. UV light.

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The scientist who developed a system of identifying the variety of strains of streptococci was

A. Hans Zimmer. B. Donald Sutherland. C. O. T. Avery. D. Rebecca Lancefield.

Biology & Microbiology