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Answer:

A. they could develop into 130 different human tissue types.

Explanation:

Embryonic stem cells are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage pre-implantation embryo. The post fertilization stage is achieved in about six weeks after which, these embryonic stems cells develop from 50 to 130 different cells.

Therefore the most unique thing about embryonic stem cells is that they could develop into 130 different human tissue types.

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Answer:

A.  

They could develop into 130 different human tissue types.

Explanation:

"Embryonic stem cells are also known as "pluripotent stem cells." They are

special cells that are formed at the very early stages of human embryonic

development. They are part of what is known as a "blastocyst." A

blastocyst is the modified blastula stage of a mammal's embryo. Stem

cells are unique because at this early stage of development, they are not

yet specialized. The cells are capable of developing into 130 different

types of human tissue. Embryonic stem cells are essentially the building

blocks of the human body."