Which of the following is an example of an irregular bone?

a. sternum
b. tarsal
c. mandible
d. femur

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?