The composition of a star is abundant in hydrogen and helium, both of which are two of the lightest elements. Because they are very light, they are usually unstable. To becomes stable, hydrogen atoms spontaneously combine with each other through a radiation process called nuclear fusion, to yield helium atoms. This process requires very high energy in the form of heat. Therefore, these lighter elements are burned in order to keep the star alive with energy.
Therefore, the answer is D.
The nitrogen cycle. Animal and plant waste decomposes and adds nitrogen to the soil, which bacteria convert into a form that plants use to grow. Animals eat the plants, which completes the cycle.
The digestive, circulatory,
respiratory and excretory systems interact in supplying matter and energy to
body cells and in removing waste. A minor malfunction in one of the systems
could lead to major malfunctions in others. It may eventually lead to cell
damage or death.
All the cells in the body need
oxygen( respiratory system) to maintain functioning--getting energy from food
(digestive system) ingested and removing the waste (excretory system). Also, the respiratory system and excretory
systems remove waste products such as carbon dioxide and urine and sweat. If it
fails, the body will lose homeostasis.
Methods developed to improve
efficiency and effectiveness of one system might help other systems preserve or improve functioning. If one system is
compromised it may be assisted with or replaced by developed methods preventing
it from accompanying damage to other systems.
Answer: Pollution will move with water, disrupting other ecosystems.
Explanation:
- skeletal system— it help you to give shape to your body.
- digestive system— it help you to digest your food.
- muscular system—it help you to move your body.
- urinary system—it help you to throw urine and unnecessary excrete from your body.
- respiratory system—it helps you in respiration which is very important for surviving.
- circulatory system—it helps to circulate blood in different parts of your body.
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