Question

Ravi was wondering why two sets of muscles are required for hand movement . he said that we can move our hand up and down with the help of bicep muscles alone. he says when bicep muscles contract then arm would go up and when it it is expands then arm would come down what's incorrect in his argument​

Answer 1

hlo my name is noor Aggarwal that thankyou for giving me this answer

Answer 2

Answer:

what is the answer can anyone tell