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leva [86]
3 years ago
5

Why can sharks swim quickly through water

Biology
1 answer:
Eduardwww [97]3 years ago
6 0

The reason why sharks can swim fast is that unlike most fish, sharks have tails that are not horizontally symmetrical . Instead , the top of a shark's tail protrudes further  back than the bottom , giving the shark  lift while swimming and making it "spring" forward at speed.

Most fish make a single water "ring"  that moves backward at the end of their tail's stroke but sharks are thought to produce two rings because of their asymmetrical  tail which bespeaks a more efficient propelling action.

It has also been discovered that sharks can raise the tiny teeth-like structures called placoid scales on their skin to create tiny wells across the surface of their skin  which reduces drag just like the dimples on a golf ball, thus enabling the shark move forward faster.




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why would shuffling genetic material to produce new combinations of characteristics be advantageous to a species?
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Answer:

Suffling of genetic material increases genetic variation in offspring which is important for evolution.

Explanation:

Genetic shuffling or genetic recombination helps in the formation of new trait combinations which increase the genetic variation in the population and this genetic variation is very much important for the evolution of species.

In sexual reproduction, the genetic shuffling occurs during the formation of gametes when the two homologous chromosomes exchange their genetic material with each other. This increase variation in gametes.

Fusion of two different gametes in sexual reproduction also helps in increasing the genetic variation in the offspring.

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3 years ago
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2 years ago
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