Answer: pressure changes
Valves of the heart open and close due to pressure changes
Explanation:
The veins are the blood vessels possessing valves. And because they carry blood away from the heart, the valves helps to prevent back flow of blood due to the low pressure of blood found in the veins.
Thus, Valves of the heart open and close due to pressure changes
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Physical indicators of healthy water quality are temperature<span> and turbidity.
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Antibodies is the vaccine
Answer:
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Explanation:
A xerophile (from Greek, Modern xēros, meaning 'dry', and philos, meaning 'loving'. It is a plant that thrives in dry environment such as desert. It is an organism that can grow and reproduce in conditions with a low availability of water,
Examples of xerophiles include Trichosporonoides nigrescens and cacti. There are many types of cacti. Trichosporonoides nigrescens is the scientific name of one of them.
over 70 percent of water goes in agriculture irrigation.
In most regions of the world, over 70 percent of freshwater is used for agriculture. By 2050, feeding a planet of 9 billion people will require an estimated 50 percent increase in agricultural production and a 15 percent increase in water withdrawals.