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Anonymous

4y ago

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What class does 95 percent of fish belong to?

chondrichthyes and osteichthyes are the two classes of gnathostomata where fishes also lies


What makes fish float?

Fishes do not exactly float, except when they die. Although fishes can move upwards and downwards by rising and sinking, sort of like a helium filled balloon. To do this, fishes need to reduce its overall density by reducing its volume without increasing its mass. For this, fishes have what we call a 'swim bladder'. This an organ that expands and contracts, just like a human lung. When the bladder is inflated, the fish has a maximum volume and is pushed to the surface. When its deflated, it has a minimum volume and sinks. In this way, fishes are capable of rising and sinking and also staying at a particular level. Hope this helped :)


Why do fish need a stream lined body?

fish need to be more streamlined than land mammals because they need to be able to stream quickly through water. They need to be able to do this for many reasons such as to either catch their prey (if they are large carniverous fish) or escape from their predator.


What is the advantage for oviparous fishes to lay many eggs and for viviparous eggs to lay only a few?

Oviparous fishes lay many eggs to increase the chances of offspring survival, as only a few may actually develop into adults. Viviparous fishes invest more energy in developing fewer offspring to ensure their survival by providing them with nutrients and protection during gestation. This leads to a higher likelihood of offspring reaching maturity compared to oviparous fishes.


Why do fish need to descend or rise to different water levels?

Fish need to descend or rise due to the temperature of which they live. They are cold blooded animals. Some fish live in very cold temperatures of water while others live in cold temperatures, but not as cold. The core of the Earth, as we know it, is filled with lava and generates heat. So the fish need to stay cold so they rise to the surface of the water, or at least, close to it. This is largely impacted by global warming.