Kenyon knows that some of the star patterns he see at night can be seen from different places on earth only during certain time of the year. Which of the following explains why theses star patterns are not seen all year long from everywhere on Earth? A) Earth’s revolution
B) Earth’s rotation
C) the sun’s revolution
D) the sun’s rotation

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.