Describe the tempature changes that occur as you move upward through the troposphere.

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Witch type of microscope is used to view very small cell components like proteins and dna?

What percentage of light hits earth's surface directly?

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.