During diffusion the molecules move in constant random motion. <span>The </span>net movement<span> of a substance from a region where it has a higher concentration to a region where it has a lower concentration, due to random molecular motion, is called </span>diffusion<span>. Diffusion is a widespread and important process which occurs in both living and non-living systems. </span>
Grilled steak should be eaten
less often to reduce her risk of breast cancer. When meats are cooked at high
temperatures such as grilling or pan frying, there is production of polycyclic
aromatic hydrocarbons and heterocyclic amines which are chemicals that can
trigger changes to the DNA and this can increase breast cancer risk.
Organisms can be UNICELLULAR where they are composed of only 1 cell or they can be MULTICELLULAR where they are composed of many cells. The first organisms to appear on earth where single celled and they developed the ability to photosynthesize and make food from inorganic compounds. UNICELLULAR organisms such as bacteria predates complex organisms that are Multi cellular
