Tracheal obstruction by a large piece of food typically involves obstruction of the tracheal obstruction by a large piece of food typically involves obstruction of the carina trachealis muscle larynx tracheal cartilage

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

Which measure of an earthquake depends on how close you are to the focus?