Answer:
The cornea acts as the eye's outermost lens. It functions like a window that controls and focuses the entry of light into the eye. The cornea contributes between 65- 75 percent of the eye's total focusing power.
Or you can answer :
The cornea is the transparent part of the eye that covers the front portion of the eye. It covers the pupil (the opening at the center of the eye), iris (the colored part of the eye), and anterior chamber (the fluid-filled inside of the eye). The cornea's main function is to refract, or bend, light.
Answer:
The main function of the circulatory (or cardiovascular) system is to deliver oxygen to the body tissues, whilst simultaneously removing carbon dioxide produced by metabolism.
Fermentation is the process by which a carbohydrate molecule is broken down into alcohol and carbon dioxide in the absence of oxygen. During this process, two molecules of ATP is produced. In the absence of oxygen, pyruvate formed from glycolysis will undergo fermentation process. During the process of fermentation, NADH from glycolysis will be converted back to NAD+. This is necessary in order for glycolysis to continue. Thus, fermentation regenerate more NAD+ and only a few molecule of ATP.
Answer:
Most of the world's coal mines come from China, India, the United States, the European Union, and Australia.
Explanation:
- <u>China: </u>In the year 2018, China alone produced approximately 3523 million tonnes of coal. Though China is the largest producer of coal in the world, it has to import coal from other countries to fulfill its energy needs. China's share in the total coal produced in the world in the last 12 years is 39.7%.
- <u>India:</u> The production of coal in India reached approximately 716 million tonnes in the year 2018. The total amount of coal produced in India in the last 12 years makes up 7.5% of the coal produced all over the world.
- <u>The United States: </u>The coal produced in the United States in the year 2018 was approximately 702 million tonnes. The last 12 year share of the coal produced in the US is 16.2% of the total coal produced all over the world.
- <u>The European Union:</u> The countries that constitute the European Union togetherly produced approximately 490 million tonnes of coal in the year 2018. The last 12-year contribution of the EU to the total coal produced in the world is 9.2%.
- <u>Australia:</u> The production of coal in Australia for the year 2018 was approximately 481 million tonnes. Australia alone produced 6.2% coal of the total world production of coal in the last 12 years.
