Based on Acanthostega Fossils,scientists Now Believe the Earliest Tetrapods

question 24

Multiple Choice

Based on Acanthostega fossils,scientists now believe the earliest tetrapods

• A)were amphibians that used their limbs to drag themselves over the land from one waterhole to another.
• B)were reptiles that resembled crocodiles.
• C)were fully terrestrial.
• D)were fish that used their limbs to raise themselves out of the water to get gulps of air for oxygen.

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Definitions:

Rod Cells

Photoreceptor cells in the retina of the eye that are responsible for vision at low light levels but do not mediate color vision.

Retina

The thin layer of tissue that lines the back of the eye on the inside, composed of light-sensitive cells and responsible for converting light into neural signals for visual recognition.

Pupil

The black-looking opening in the center of the iris, through which light enters the eye.

Emotions

Advanced mental states characterized by three fundamental aspects: personal perception, bodily reaction, and an external or expressive reaction.