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A Single Group of Test Units Is First Exposed to a Treatment,and

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A single group of test units is first exposed to a treatment,and then a measurement is taken on the dependent variables.Which experimental design is this?


Definitions:

Fossil Record

The collection of fossils, which provides historical evidence of past life and evolution on Earth.

Ferns

Ferns are non-flowering vascular plants that reproduce via spores and have fronds, belonging to a group called Pteridophyta.

Amphibians

Cold-blooded vertebrates that can live both in water (using gills to breathe) and on land (breathing with lungs) at different stages of their life.

Prebiotic Soup Hypothesis

A theory suggesting that life on Earth began in a "soup" of organic molecules, possibly in the oceans, facilitated by energy from sunlight or geothermal sources.

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