How do whales differ from fish? a. whales use blowholes for breathing. b. whales have scales that cover their skin. c. whales develop lungs following metamorphosis. d. whales fertilize externally.

The answer is A. Whales use blowholes for breathing.

It might be c, but I cant find any information in it, and b and d are characteristics of fish.

Good Luck!

The correct answer is Whales use blowholes for breathing

In order to breathe in a easier way whales have blowholes that are present on the top of the head. They form the passage way towards trachea from where air is passed and fills the lungs. This blowhole helps them to breath effortlessly during the resting phase. They do not use mouth to breathe as it is not connected to the throat of the whales.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.  

its true i dont know very sorry b much < 3 big fan

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