1. a fish that has a flexible skeleton made of cartilage is known as a . 2. a row of organs that are sensitive to changes in water pressure is called a . 3. a fish that has muscular pectoral and pelvic fins supported by rod-shaped bones is known as a . 4. movement of the allows some fish to breathe without swimming. 5. a fish that has a bony skeleton and thin, flexible supports in its fins is known as a . 6. the gas-filled sac found in many fishes is called a .

1. chondrichthyan

2 lateral line system

3. lobe fins

4 operculum

5 ray finned fish

6 swim bladder

Explanation:

A fish with a flexible cartilage skeleton is defined as a chondrichthyan

A lateral line system is a column of organs that are sensitive to small change  in water pressure

Fish with strong pectoral and pelvic fins with rod-shaped bones are known as lobe fins

The operculum movement helps certain fish to breathe without swimming.

A fish with a bony skeleton and long, flexible fins is defined as ray-finned fish

A swim bladder is the gas-filled bag used in several fishes.

tissue

explanation:

it is actually formed by geoup of cells which is tissue

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.