How many days old is this embryo? 
Definitions:
Internal Validity
The extent to which a study accurately demonstrates a cause-and-effect relationship between variables.
External Validity
The extent to which the results of a study can be generalized to other situations and to other people.
Individualized Approach
A method tailored to meet the unique needs of an individual, considering their personal circumstances, preferences, and characteristics.
External Validity
The extent to which the findings of a study can be generalized to other situations, settings, or groups.
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