According to natural selection, individuals that tend to survive are those that have which of the following? the ability to quickly produce the most offspring
the largest and strongest body structures
the genetic variations that are best suited for their environment
the longest legs and fastest running speeds

The genetic variations that are best suited for their enviornment

Explanation:

Those that are not well suited for their environment will die off, leaving only the ones that are suited for it. This species will slowly take hold until the species has adapted and become a completely different one.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.