In terms of organisms, photosynthesis occurs in autotrophes that contain the green pigment chlorophyll. This would include the entire plant kingdom, half of the Protista (the algae), & half the Moneran Kingdom (the blue-green algae).
A standard twin mattress is 39 by 75 inches. A king is 76 by 80 inches. This means that a headboard for a king bed is going to be about 76 inches or wider, plenty wide enough to go along the length of a twin bed. Headboards are often slightly wider than the bed for which they are made.
Twin Size Mattresses. Twin Mattress Dimensions are 39 x 75. The twin mattress is the most common size found in children's rooms, and has the perfect dimensions to be used on daybeds, trundle units and hideaways. The width of a twin mattress (39) is the minimal amount of space needed for a single person to lie comfortably each night.