When the quadriceps contact what also must happen at the same time?

a. the gastrocnemius must contract.

b. the hamstrings must relax.

c. the hamstrings must contact.

d. the gastrocnemius must relax.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

How will you manage your time to accomplish the necessary tasks both on the job and at home?

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?