The graph below shows how the level of carbon dioxide in the atmosphere has changed over the last 150,000 years Which environmental factor has been most recently affected by these changes in carbon dioxide level? 1. light intensity
2. size of consumers
3. types of decomposers
4.atmospheric temperature

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.