Dr. tylka is conducting research about the risk of developing eating disorders in adolescent boys. she concludes that her findings apply not only to the sample of high school boys she studied, but to other males in other settings and contexts. in this regard, dr. tylka is stating that her findings have high validity.

External validity.

Explanation:

When any research is done, then there are two possibility of its validation. One is internal validation and other is external validation.

The internal validation refers to the condition in which the conclusion of the study is within context of the particular study.

The external validation refers to the condition in which the conclusion of the study is out of the  context.

Here, The study was performed only on the eating disorders in the adolescent boys but the conclusion included other males of different age groups.

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b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.