What do you call one version or form of a trait?

One version or form of a trait is called an allele  

An allele is an alternative form of a gene that is situated at a given locus (position) on a specific chromosome. Alleles determine recognizable traits that can be transmitted from parents to offspring through sexual reproduction. In multi-cellular organisms that possesses two copies of each chromosome (diploid organism), two alleles forms the individual's genotype. When allele pairs are identical, they are said to be homozygous, while when they are different, they are heterozygous.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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