Mechanical digestion begins in the mouth as the food is chewed.(it prepares the food for chemical digestion) Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates.
<span>They do not have a backbone.They are multi-cellular. They have no cell walls, like all other animals.<span>They reproduce by two reproductive cells, or gametes, coming together to produce a new organism of their species.</span></span>
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