Level 10 Listening (20%)

Bacteria are mostly really helpful. Bacteria play a crucial role in various ecological processes such as nutrient cycling, decomposition, and nitrogen fixation. They also contribute to human health by aiding in digestion, producing vitamins, and boosting the immune system. Additionally, some bacteria are used in the production of antibiotics, vaccines, and other medical treatments. While there are harmful bacteria that can cause diseases, the majority of bacteria are beneficial and essential for the functioning of ecosystems and the well-being of humans.

Mites are tiny organisms that feed on dead skin cells. They are commonly found in household dust and can also live on human and animal skin. Mites have specialized mouthparts that allow them to scrape and consume dead skin, which provides them with a source of nutrition. Therefore, it is accurate to say that mites eat dead skin.

The question suggests that the person is experiencing a problem related to their hair, ears, or eyelashes. Since mites are commonly found in eyelashes, the correct answer is "eyelashes." Mites in the eyelashes can cause symptoms such as itching, redness, and irritation. It is important to seek medical attention if this problem persists.

The answer is "Seven, 7" because the word "octillion" indicates a quantity of 10^27. However, the human body does not contain such a large number of cells. On average, an adult human body contains approximately 37.2 trillion cells, which is much smaller than an octillion. Therefore, the correct answer is "Seven, 7" as it accurately represents the number of cells in the human body.

Mites are really small creatures, similar to insects. Mites belong to the arachnid family and share some similarities with insects, such as their small size and segmented bodies. However, mites have eight legs, while insects have six. Both mites and insects are diverse and can be found in various habitats worldwide. They play important roles in ecosystems, although some mites can be harmful to plants, animals, and humans. Overall, mites and insects are both fascinating and important components of the natural world.

Mites are tiny organisms that commonly live on human skin. They feed on dead skin cells, which is their primary source of nutrition. These microscopic creatures are not harmful and are a natural part of the human microbiome. They help to clean up dead skin cells and maintain a healthy balance on the skin's surface. Therefore, the correct answer is that mites eat dead skin.

The correct answer is "Really you". This suggests that only about one-tenth of the cells in your body are actually human cells, while the rest are microbial cells. This highlights the fact that our bodies are home to a vast number of microorganisms that play important roles in our overall health and well-being.

Mites are known to be extremely small creatures, and the given answer states that they are "a third of a millimeter long." This implies that mites are even smaller than 1 millimeter, specifically around 0.33 millimeters in length. Therefore, this answer accurately describes the size of mites.

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The explanation for the answer "Bacteria" is that our bodies are made up of trillions of cells, but only about one-tenth of these cells are human cells. The majority of the cells in our body are actually bacteria. These bacteria live on our skin, in our gut, and in other parts of our body, forming what is known as our microbiome. These bacteria play important roles in our health, such as aiding in digestion and supporting our immune system. Therefore, it can be said that only one-tenth of the cells in our body are truly "us," while the rest are bacteria.

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