How structural adaptions support the theory of evolution by natural selection ?

natural selection is based on structural changes

Explanation:

Natural selection was proposed by Charles Darwin, who saw the changes of animals for how they were before through fossils, and how they are now, comparing their physical characteristics, among them, the structural adaptations of animals.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

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.