____ is the scar on the seed coat through which the developing seeds were attached to the frui

The term you are looking for is "hilum."

The hilum is a small scar on the seed coat that marks the point of attachment of the seed to the fruit. It serves as the location where the seed was connected to the ovary of the plant before it matured and dropped to the ground. This structure is critical as it indicates the former position of the seed in relation to the fruit's vascular system, which supplied nutrients and water to the developing seed during its growth. The size and shape of the hilum can vary between different plant species and can also play a role in seed identification. Understanding the anatomy of seeds, including the hilum, is essential in fields such as botany, agriculture, and horticulture, as it can impact seed germination and plant development.