Which part of meiosis , meiosis 1, or meiosis 2 responsible for reducing chromosome number by half in the cell

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?