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2 years ago

A key derived character of sharks and rays that distinguishes them from ray-finned fishes is

Biology

1 answer:

o-na [289]2 years ago

3 0

Answer:

Jaws and a swimming bladder

Explanation:

A defining characteristic between sharks and rays that distinguish them from ray-finned fish is the *possession of jaws in sharks* and rays;and the *possession of swimming bladder in ray-finned fishes*.

Characteristics of sharks and rays are as follows :

They are cartiiliginous fishes; they possess *strong jaws* lined with teeth; body dorsoventrally flattened, fusiform (spindle shaped) with heterocercal tail(diphycercal in Chimaeras); paired fins; *no swimming bladder or lungs*; pelvic fins in males often modified to form clappers; Gill arches internal to gills; reduced notchord; lateral-line system; paired nostrils; internal nares absent; separate sexes; internal fertilization and direct development; oviparous, oviparous, or ovoviviparous. Examples include, Spiny dog fish or dog shark, Ray Raja, Chimaera.

Characteristics of ray-finned fishses:

They generally lack paired fins; no internal nares; *air sacks usually function as swimming bladder*; skeleton usually well ossified. Blind olfactory sacs (do not open into the mouth); Tail homocercal. Examples include Tilapia, Claris,and Polypterus.

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2 years ago

According to the data above, humans exhibit a high chance of surviving into old age.

Rom4ik [11]

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2 years ago

Three linked autosomal loci were studied in cucumbers: fruit color (dark vs. light), tendril size (long vs. reduced) and fruitin

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Answer:

Explanation:

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TIME TO FRUIT TENDRIL SIZE FRUIT COLOR NUMBER

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early normal dark 28

early reduced dark 25

early reduced light 483

normal reduced light 36

normal reduced dark 810

TOTAL

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3 years ago

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