If you remove a set of cells from an early embryo, you observe that the adult organism lacks the structure that would have been produced from those cells. Therefore, the organism seems to have undergone a) autonomous specification b) conditional specification c) Morphogenic specification d) Syncytial specification

a) Autonomous specification.

Explanation: Autonomous specification occurs in most invertebrates. The fates of blastomeres in early developmental stages is invariant (unchangeable). In this, the cells show mosaic development i.e. they cannot change fate if any blastomere is lost. In the above question, cells were removed from early embryo i.e. blastula.