Read the following scenario and identify the control group, the experimental group, the independent variable, and the dependent variable. A medicine company wants to test their new formula Tylenol on the effects of symptom disappearance like fever and chills. In order to prove its quality, they set up a group of 100 people. 50 of these people get the new formula Tylenol while the other 50 people get the old, normal Tylenol.

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)

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

i think the answer is b.