Which conditions are necessary for natural selection? Check all that apply.
Populations do not have genetic variation.
Populations have genetic variation.
The environment changes.
The environment stays the same.
Organisms must have specific traits in order to survive and reproduce.
O Organisms with any traits will survive and reproduce.

The answer is B, C,E

What mass will a pumpkin have a force of 450 newton’s accelerates it to 110 m/s^2? include the correct units.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?