What is photoperiodisom?

Is plastic milk jug opaque? Why do many clouds reflect a significant amount of sunlight back to space? What is the plot in A Wrinkle in Time? What is difference between object space and image space in graphics? What is the antonym for space? How do you protect curtains from sun damage? What kind does each typically bring? Where does a rainbow comes from? How many people were astronauts when the first people landed on the moon? What causes the light on the moon? Why do eyeglasses fog up when you come inside from the cold? How many people did it take to put the man on the moon? What would Mars need in order to have collection or accumulation? Why does SONAR use satellites? How would the change in the suns path from summer to winter affect the length and position of shadows? Gravity acts on any two objects with mass any where in the universe? Radars can be used to detect tornadoes true or false? What would your weight and mass be if your were on the moon? Did the NASA program end? How can galaxies collide if they are moving away from each other?