Conduction can only occur between two objects when -
1. one object is
less dense than
the other
2. both objects
are in physical
contact with
each other.
3. one of the
objects is made
of a metal.
4. both objects
are exactly the
same
temperature.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.