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.
These dimensions can also be used as a guide for mattress pads and covers. 1  Twin Fitted Sheet = 39 x 75 inches. 2  Twin Extra Long Fitted Sheet = 39 x 80 inches (Commonly referred to as twin XL, TXL, extended twin, or extra long twin.) 3  Full Fitted Sheet = 54 x 75 inches.