What factors contributed to the northeasts high concentration of factories?

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

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!