Examlex
________ is an example of a primary reinforcer, whereas ________ is an example of a secondary reinforcer.
Blastocyst
An early stage in the development of an embryo, consisting of a sphere of cells surrounding a fluid-filled cavity, before implantation in the uterus.
Ectoderm
The outermost layer of cells or tissue of an embryo in early development, which gives rise to the central nervous system, skin, and other structures.
Endoderm
The innermost layer of cells or tissue of an embryo in early development, which gives rise to the lining of some internal structures like the gut.
Blastocyst
An early stage of embryonic development characterized by a sphere of cells enclosing a fluid-filled cavity and the inner cell mass that will develop into the embryo.
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