Ceres: The largest object that orbits in between Mars and Jupiter in the asteroid belt, Ceres has an average orbital speed of 17.822 kilometers per second. It was discovered in 1801 by the Italian monk and astronomer Giuseppe Piazzi. In 2006, Ceres was classified as a dwarf planet.
Diffusion is the net passive movement of particles (atoms, ions or. molecules) from a region in which they are in higher concentration to. regions of lower concentration. It continues until the concentration of. substances is uniform throughout. Some major examples of diffusion in biology: â¢ Gas exchange at the alveoli â oxygen from air to blood, carbon. dioxide from blood to air. â¢ Gas exchange for photosynthesis â carbon dioxide from air to. leaf, oxygen from leaf to air.
Gas Exchange. Gas exchange refers to the passing of Oxygen from the alveoli into the blood flow and the excess Carbon Dioxide (CO2) within the blood flow passing back into the alveoli to be breathed out. Each tiny alveoli is covered in a network of capillaries (tiny blood vessels) which make this process easier.