The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the a. removal of ca2+ ions from the sarcoplasm only. b. hydrolysis of atp only. c. movement of na+ across their membranes only. d. removal of ca2+ ions from the sarcoplasm and hydrolysis of atp. e. removal of ca2+ ions from the sarcoplasm and hydrolysis of atp and movement of na+ across their membranes.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

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