Examlex
A child who gets rewarded with candy on the average of every other time she asks her grandmother for a "treat" is being rewarded on a _____ schedule.
Mesoderm
The middle layer of an embryo in early development, which gives rise to muscles, bones, and circulatory and excretory systems.
Germinal Period
The initial two weeks of prenatal development after conception, characterized by rapid cell division and the beginning of cell differentiation.
Blastocyst
An early stage of embryonic development that consists of a sphere of cells surrounding a fluid-filled cavity.
Embryo
The early stage of development in multicellular organisms, in humans this phase extends from the second to the eighth week of gestation.
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