Which statement best describes the amount of catalyst that remains at the end of a reaction? More catalyst is present at the end than at the beginning of the reaction. Less catalyst is present at the end than at the beginning of the reaction. The amount of catalyst is the same at the end as at the beginning of the reaction. The catalyst is consumed by the reaction, so none remains at the end of the reaction

What is the relation ship between structure and function in an organism

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.