What is the thickest layer of the atmosphere?

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

What does it mean for an allele to be dominant?

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!