<span>Genes are the main cause of a Carabelli Cusp.
This is a condition where there is an additional cusp on the first molar of the
tooth and become less pronounce when progressing to the second and third
molars. In some cases, the cusps' forms included pits, ridges, and furrows. <span>
<span>The Carabelli
Cusp is a condition most common in Europeans and rarest in the Pacific Islands.
It is an inherited feature from a homozygote or a heterozygote gene that can be
present or absent in some
individuals. It was
discovered in the year 1842 by Georg Carabelli, a court dentist of the Austrian
Emperor Franz. </span></span></span>
Due to there being no answer choices I can only really give an example.
The non-living parts of an ecosystem are called abiotic factor, so Sunlight, temperature, atmospheric gases, water and soil, Biotic factors are living, so a interaction is with plants, plants require sunlight, soil, water, and CO2 to make food.
