Threats to Internal Validity Are Those That Jeopardize the Study

question 3

True/False

Threats to internal validity are those that jeopardize the study conclusions about whether an intervention in fact caused a difference in the study population.

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Definitions:

Green Algae

A large group of photosynthetic, primarily aquatic organisms, including both unicellular and multicellular forms, that are similar to plants in having chlorophyll a and b.

Amoebozoans

A group of amoeba-like eukaryotes, characterized by their amorphous shape and movement through cytoplasmic streaming.

Flagella

Long, whip-like appendages that protrude from the cell body of certain prokaryotic and eukaryotic cells, used for locomotion or sensory functions.

Serial Endosymbiosis

The hypothesis that certain organelles such as mitochondria and chloroplasts originated as symbiotic prokaryotes that lived inside other free-living prokaryotic cells.