Use Darwin’s theory of Natural Selection to explain how the trunks of elephants might get longer over many

a symbiotic relationship with the mitochondria

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.