Gas exchange happens in the spongy mesophyll tissue of the leaf. Spongy mesophyll cells are covered by a thin layer of water and loosely packed. When the plant is photosynthesising during the day, these features allow carbon dioxide to diffuse into the spongy mesophyll cells, and oxygen to diffuse out of it.pongy mesophyll cells are covered by a thin layer of water and loosely packed. When the plant is photosynthesising during the day, these features allow carbon dioxide to diffuse into the spongy mesophyll cells, and oxygen to diffuse out of it.
In biometrics and forensic science, minutiae are major features of a fingerprint, using which comparisons of one print with another can be made. Minutiae include: 1  Ridge ending â the abrupt end of a ridge. 2  Ridge bifurcation â a single ridge that divides into two ridges. 3  Short ridge, or independent ridge â a ridge that commences, travels a short distance and then ends.
Mid-Ocean Ridges A long, undersea mountain chain that forms along the floor of the ocean is called a mid-ocean ridge. For the most part, mid-ocean ridges do not rise above sea level. However, Iceland is one place where a mid-ocean ridge has risen above the oceanâs surface.id-Ocean Ridges A long, undersea mountain chain that forms along the floor of the ocean is called a mid-ocean ridge. For the most part, mid-ocean ridges do not rise above sea level. However, Iceland is one place where a mid-ocean ridge has risen above the oceanâs surface.