In plant cells what are the holes between directly connected cells used for intracellular communication called? 1. chemical signal
2. receptor
3.plasmodesmata
4. gap junctions
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What are the result of when individual components in an organism interact with others to create noval stucture and function called

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.

What is the farthest destination to date for a human spaceflight mission?