Here's a hypothesis for the duckweed experiment: “if duckweed is grown at pH 5, then it will grow at the same rate as when grown at pH 7, or normal pH, because it can tolerate mildly acidic environments.” Which elements should be controlled variables for this experiment? Check all that apply. environmental pH
timing of experiment
duckweed population
environmental light
amount of nutrients
environmental temperature

answer: wheelchair 100% postive

explanation: brainlest

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

i say that the answer is 'd'