Which of the following is the correct explanation of a derived character A. the presence of a backbone is a derived character of mammals because all mammals have a backbone
B. the presence of four limbs is a derived character of snakes because the ancestors of modern snakes had limbs even though modern snakes do not
C. the presence of hair is a derived character of mammals because all mammals have it
D. retractable claws are a derived character of carnivors because some of the animals that are carnivores have retractable claws

it is a learned trait

explanation:

children tend to take more after their grandparents more than their parents. it’s the dna you received that was passed down to you somewhere in your family. maybe one of your grandparents had/has straight hair and you might have gotten it from them.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."