Following are the statements about prostomium of earthworm.
(a) | It serves as a covering for mouth. |
(b) | It helps to open cracks in the soil into which it can crawl. |
(c) | It is one of the sensory structures. |
(d) | It is the first body segment. |
Choose the correct answer from the options given below:
1. (a), (b), (c) and (d) are correct
2. (b) and (c) are correct
3. (a), (b) and (c) are correct
4. (a), (b) and (d) are correct