Examlex
Define external validity in research design. Describe in detail one threat to the external validity of a research study. Be sure to specify how that characteristic is a threat to external validity.
Derived
A term used to describe traits, characteristics, or features that have evolved in a particular species or lineage from an ancestral state, indicating evolutionary change.
Platypuses
Aquatic mammals native to Australia known for their unique characteristics such as laying eggs, having bill and webbed feet.
Therians
Mammals excluding the monotremes, comprising the live-bearing marsupials and placental mammals, characterized by traits such as viviparity and mammary glands.
Therapods
A group of bipedal dinosaurs, mostly carnivorous, that includes modern birds and their extinct ancestors like Tyrannosaurus rex.
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