Trex
Capitalize trex when you are using it as a proper noun, such as a specific thing or trademark.
Yes
trex
is trex decking safe for dogs?
Skin color grayish.
his skin color is green
Trex was 40ft long, but it is not the biggest meat eating dionsaur
No, TRex was Trianosaurus Rex, an extinct (fossil) dinosaur.
Her skin color is olive.
white skin color
his skin color was black or African American his skin color was black or African American