Some animal and plant species are in danger of becoming extinct because of 1. an increase in human population controls
2. the exploitation of these species for their products
3. the rapid reproduction of these species
4. an increase in available food supplies

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)

allowed for the prediction of the properties of missing elements.

the answer is c.

by: nicholas dooley