Messages are sent to the brain or spinal cord from the body via neurons; messages leave the brain and spinal cord via neurons.

List two limitations of natural selection

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction