<span>
It's solar, because s</span>olar energy is a renewable resource that is virtually endless as long as the sun shines.<span />
The various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation.
Banana peels can be decomposed by bacterial action, so they are biodegradable.
The parents both need to be heterozygous, meaning they have to have one dominant and one recessive allele.
The double-helix shape of DNA.
