Blood Vessel, skin cell, Red Blood Cell

Trait: any distinguishing feature of an individual
1.Physical vs Behavioral
2.Visible vs Hidden
3.Innate vs Learned

situs inversus: a condition where the organs are arranged in a mirror image of the normal positioning.

Deoxynucleotides: the building blocks of DNA
Adenine, Thymin, Guanine, Cytosine