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Hidden observation studies must be alert to situations in which the subject's right to privacy must be protected.
Extant Species
Refers to species that are currently living and have not gone extinct.
Eusthenopteron
An extinct genus of lobe-finned fish, considered an important precursor to early tetrapods and amphibians.
Acanthostega
An extinct amphibian from the late Devonian period, known as an early tetrapod linking fish to terrestrial vertebrates.
Tiktaalik
An extinct fishlike vertebrate from the late Devonian period, presenting features common to both fish and early tetrapods, bridging an evolutionary gap.
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