What characteristics can you observe in the gills that make them an efficient respiratory organ?

Lots of folding = lots of surface area for diffusion.  

Lots of vascularization.  

Countercurrent exchange system.  

Located off of the throat to help water get rammed down the throat in a single direction, across the gills

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

the correct answer should be false

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