Answer:
6.7 minutes
Explanation:
In a solid such as rock, the primary wave can travel at 5 km/sec; it would take 400 seconds, or about 6.7 minutes to travel 2,000 km.
1. D
2. C
3. B
4. A
5. Alveoli
6. larynx
7. mucus
8. nitrogen
9. diaphragm
10. Air enters the body through the mouth or nose and passes through the pharynx and larynx. Then it travels down the trachea and branches through the bronchi into the two lungs. In the lungs, small alveoli are the site of gas exchange where carbon dioxide diffuses into the lungs for exhalation, while oxygen from the air diffuses into the capillaries surrounding the alveoli to be pumped throughout the body.
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Answer:
Diet is an important risk factor in coronary heart disease. Food-related risk factors include obesity, high blood pressure, uncontrolled diabetes and a diet high in saturated fats. A low-saturated fat, high-fibre, high plant food diet can substantially reduce the risk of developing heart disease.
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Predator/prey web relationship is found in all ecosystem. A rise in the snowy owl population would have what effect on the snow goose in that The snow goose population would rise due to lemming, and subsequently fox, populations declining.
- Food webs often has predator/prey relationships. They show the direct relationships in ecosystems such as the predator-prey relationships.
- Predators includes big cats such as cheetahs and lions. They often hunt prey in temperate grasslands.
In North America, predators such as wolves, coyotes and foxes mostly hunt for mice, rabbits and deer.
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