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.
A twin bed is the smallest adult mattress size, and it measuresÃ approximately 38 inches wide by 75 inches long. Twin beds and full size beds are actually both the same length. For individuals who are tall but require a twin sized bed, a twin extra-long mattress size is available.