61. If a 1.0 M solution of HA, a weak acid, has a pH of 2.0, then the value of Ka, the acid-dissociation constant, for HA is closest to A. 1.0 × 10-4 B. 1.4 × 10-4 C. 1.0 × 10-2 D. 1.4 × 10-2 E. 1.4 × 10-1

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the answer is symmetrical : )