It has been suggested that gains in strength during the first 6-weeks of strength training is due to
1. increased hypertrophy of muscle fibres
2. greater slow twitch muscle fibre activation
3. increased motor unit synchronisation

It would be the second choice the phenotype

Genetic engineering is the answer.

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.