MCQ
Study of inter - relationships between organisms and their environment is
- ✓Ecology
- BEcosystem
- CPhytogeography
- DEthology
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$R$ : All vertebrates have hepatic portal system.
| Column $I$ | Column $II$ |
| ($a$) Ovary | ($i$) Human chorionic Gonadotropin |
| ($b$) Placenta | ($ii$) Estrogen and Progesterone |
| ($c$) Corpus Iuteum | ($iii$) Androgens |
| ($d$)Leydig cells | ($iv$)Progesterone only |