Examlex
Which of the following is a threat to internal validity?
Toxin
A poisonous substance produced within living cells or organisms.
Reproductive Cells
Cells that are involved in sexual reproduction, including sperm and egg cells, carrying genetic information to offspring.
Human Immunodeficiency Virus
A virus that attacks the immune system and can lead to acquired immunodeficiency syndrome (AIDS), a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.
Malignant Tumours
Cancerous growths that have the ability to invade nearby tissues and spread to other parts of the body.
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