Question
Which layer of uterus undergoes cyclic changes during the menstrual cycle?
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The diagram above is that of a typical biogas plant.Explain the sequence of events occurring in a biogas plant. Identify a, b and c.| S. No. | Column I | S. No. | Column II |
| A. | Acrosome | 1. | Motility of sperm towards the egg. |
| B. | Head | 2. | Powerhouse of the sperm; contains a number of mitochondria. |
| C. | Tail | 3. | Contains the genetic material. |
| D. | Middle piece | 4. | Contains enzymes to dissolve egg envelopes. |