C, because alleles are alternative forms of a gene that arise from mutation.
As the earth has active tectonics we know that rocks are recycled and the oldest rocks may therefore just be the oldest rocks that have not been recycled yet. We know the true age of the earth by looking at radioactive isotopes of things like spacedust and meteors that formed at the same time as the earth as they have not been affected by the tectonic process of recycling here on Earth.
.............................Correct.
Answer:
Ecosystem, community, species, population
Explanation:
High melting point
Good conductors of heat and electricity
Lustrous (shiny)
Malleable (can be hammered)
