Shells are considered biotic because they come from living things. Biotic describes something living or use to be living such as plants and animals. So shells are considered biotic because they come from a living organism.
~~~~~~~~~~~~~~~~~~~
Hope that helped:)
~~~~~~~~~~~~~~~~~~~
Hydrogen is more frequently bonded with Carbon.
No it is not possible since there can be dominated or recessive alleles involved. A heterozygous for a specific gene can display the same phenotype as a homozygous for the same gene.
If your body has developed a tolerance to a medication you're taking, it means the medication at your current dose has stopped working as effectively as it once did. It might mean your body becomes used to the medication, and you don't get the same benefits or effects as before. Drug tolerance is indicative of drug use but is not necessarily associated with drug dependence or addiction. The process of tolerance development is reversible and can involve both physiological factors and psychological factors.
