Several different amino acids join together to form a protein. How do any two types of amino acids differ from one another? a. the number of amino groups in the molecule b. the number of carboxyl groups in the molecule C. the chemical structure of the R group in the molecule d. the number of chemical bonds formed by the central carbon atom

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.

Cbecause it is the only one describing a habitat

  like australopithecus afarensis; probably the direct ancestor of this group. africa: 5.8 to 4.4 million years ago.