Research in plant biotechnology has focused primarily on characteristics that
a. improve resistance to pests, reduce the need for pesticides, and increase survival rates in adverse growing conditions.
b. allow genetically engineered seeds to be prepared within two months.
c. allow genetically engineered seeds to double in size within one year.
d. reduce the need for other genes to be introduced into a plant genome.

they need it to survive

explanation:

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise