| List I | List II | ||
| A. | Methanobacterium | I. | Butyric acid |
| B. | Monoseus purpuress | II. | Break down of cellulose |
| C. | Clostridium butyricum | III. | Clot buster |
| D. | Streptococcus | IV. | Blood-cholestrol lowering agent |


Identify the part of the sentence that contains a grammatical error:
Each of the boys have submitted their assignment on time.
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world