Pls need helps with this question

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

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

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )