Balance in nature occurs when there are interactions between organisms and the environment that maintain ecosystems at an optimal level. Key natural cycles that help maintain this balance include the nitrogen cycle, water cycle, and carbon cycle. The carbon cycle involves carbon dioxide being used by plants for photosynthesis and later released by animals through respiration, burning, and decomposition. The water cycle involves water being used by plants and animals and later released back into the atmosphere through transpiration and respiration. A food chain shows the relationship of energy transfer from producers to consumers.

1. BALANCE IN NATURE Balance in nature occur when have interactions between organisms and environment that maintain their ecosystem to optimum level.

2. Natural Cycles Natural cycles that help to maintain balance in nature are: Nitrogen cycle Water cycle Carbon cycle

3. Carbon cycle Carbon is important as a component for organic substance such as carbohydrate, lipids and protein. Plants needs to carry out photosynthesis by using carbon dioxide. Animals obtain carbon from foods that composed from decomposition process. Carbon dioxide was released to the atmosphere during process (a) respiration (b) burning (c) Decomposition death animals

4. Carbon cycle

5. Water cycle Water is very important as a source of nature. All living organisms need water to survive. Plants obtain water from soil and animals obtain water from food. Transpiration process of plants and respiration by organism released water vapour into atmosphere.

6. Kitar air Air di muka bumi ini disejat oleh tenaga solar untuk membentuk wap air. Melalui kondensasi, wap air di atmosfera memebentuk awan dimana akan turun sebagai hujan. Air hujan akan mengalir semula ke sungai-sungai, tasik, kolam dan laut-laut.

7. Siratan makanan

8. Siratan makanan ialah rangkaian interaksi diantara beberapa rantai makanan. Rantai makanan menunjukkan hubungan dimana pemindahan tenaga daripada pengeluar ke pengguna-pengguna. Siratan makanan