Sachin Gupta on Instagram: "Trick To Learn Examples of Marginal and Basal Placentation Struggling to remember biology concepts for exams? This short video shares an easy biology trick to help you learn faster and revise better. Perfect for exam preparation, last-minute revision, and quick concept recall. Watch till the end, save this video for revision, and make biology simple. More biology tricks for exams coming soon. #biology #biologytricks #biologytips #biologyshorts #biologyrevision #biolog