Is the closest relative to modern humans.
cro-magnon
homo erectus
neanderthals

The correct answer for the blank is- Neanderthals.

Neanderthals are the extinct species, which are considered as the closest relative to modern humans.

They had lived some parts of Asia and throughout Europe from approximately 400,000 to 40,000 years back. These relatives were adapted for hunting of large Ice Age animals.

A small portion of Neanderthal DNA is shared by modern humans, which indicates that they are the closest relative to modern humans.

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.