Which of these choices is the definition of allele?

Exercise has no positive effects on the nervous system? true or falseu

Which statement best describes the role of the artificial heart? the artificial heart is a good replacement option for individuals who do not want a human heart. the artificial heart has been a great option because it can keep patients alive for a very long time. the artificial heart is not a good option because of the high possibility for rejection. the artificial heart has limited usefulness but can prolong life or be a tool to use while waiting for a transplant.

Tobacco is question 17 options: made from nicotine an agricultural crop a synthetic plant both a and b