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Other than the Cyclostomata, all other fishes have scales in…

Other than the Cyclostomata, all other fishes have scales in their dermis.  Sharks and rays have leathery skin containing __________________ scales

Published November 29, 2025
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The original form of the perforated pharynx was to act as a…

The original form of the perforated pharynx was to act as a filter-feeding device. It then changed to pump water for what purpose?

Published November 29, 2025
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Write down the five diagnostic characteristics of the chorda…

Write down the five diagnostic characteristics of the chordates 

Published November 29, 2025
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The earliest vertebrates are found as fossils from sedimenta…

The earliest vertebrates are found as fossils from sedimentary rocks in China and Canada, dating back to the early Cambrian. Larger bonier fossils of fish-like animals called ostracoderms are found in deposits from the ________________________

Published November 29, 2025
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Vertebrates can be divided into two groups — those with jaws…

Vertebrates can be divided into two groups — those with jaws, the gnasherostomes, and those without jaws, the agnathans.

Published November 29, 2025
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Arthropods have a nonexpandable outer cuticle called the exo…

Arthropods have a nonexpandable outer cuticle called the exoskeleton.  When they need to get larger, they have to molt and shed their outer cuticle. This process is called _____________

Published November 29, 2025
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Hagfish and Lampreys are closely related, jawless, fish.

Hagfish and Lampreys are closely related, jawless, fish.

Published November 29, 2025
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Some bony fishes are able to extract as much as ____________…

Some bony fishes are able to extract as much as _____________% of the oxygen passing over their gills.

Published November 29, 2025
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Arthropods are found in all habitats except in freshwater

Arthropods are found in all habitats except in freshwater

Published November 29, 2025
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The Nyquist criterion is primarily used to determine:

The Nyquist criterion is primarily used to determine:

Published November 29, 2025
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