Step 1: Understanding the Concept:
Abortion refers to the medical termination of pregnancy. Safe abortion is allowed and performed under controlled medical conditions up to a certain stage of foetal development.
Blastula: Very early embryonic stage (few days after fertilization).
Organ formation: Happens during early foetal development. Abortion at this stage may cause complications.
Mature embryo: Abortion is performed when the embryo has developed but is still within the legal and safe limit prescribed by medical authorities.
Step 2: Detailed Explanation:
Safe abortion is legally and medically carried out when the embryo has reached a mature but not fully developed stage, typically within the first trimester (up to 12 weeks). Beyond this stage, abortion may pose serious health risks to the mother.
Step 3: Final Answer:
Safe abortion usually occurs at the stage of a Mature embryo.