5 Which of the following is NOT required for natural selection to occur?*
(2 Points)
The environment must remain constant and unchanging.
There must be some differences within the population of organisms.
The organisms must reproduce.
O There must be a heritable trait passed from one generation to the next

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!