What are 2 methods sciebtists use to determine the evolutionary history of a species?

If your brakes give out, why can't you just pull the keys out of the ignition?

The ammonia molecule (NH3) has a dipole moment of 5.0*10?30C? m. Ammonia molecules in the gas phase are placed in a uniform electric field E? with magnitude 1.8*106 N/C.

Why does earth rotates about it's axis?

Where would you except to find the center of gravity of a plastic ruler

A tow truck pulls a 1500 kilogram car wit a net force of 4000 Newtons. What's the acceleration?

What is the result of a mutation during replication A: the strands are different B: the strands are identical c: the strands are broken D: the strands are continuous

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space