Asthma occurs when the airways to the lungs become too narrow. How would the circulatory and respiratory systems be affected by asthma?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

9. the history of life on earth is recorded in

You are observing different types of cells in your science lab. one cell has many chloroplasts. what is the most likely function of this cell? a. energy production b. photosynthesis c. reproduction d. digestion