A. Objective The learners should be able to investigate changes that happen in the absence of oxygen. B. Materials ● fire. Activity: TITLE: ABSENCE OF OXYGEN Jar with cover (Jar A) Jar without cover (Jar B) 2 same sized candle (small) Match or lighter Timer Ruler C. Precautionary Measure Remember to handle match or lighter carefully and don't play with it for it can cause D. Procedure 1. Label the jar with cover with Jar A and the jar without cover as Jar B. 2. Light the candles with a match and put the candles in each jar. 3. Record the time when the candles are lighted and the time when the light was put off. 4. Cover the Jar A and observe what will happen. 5. Measure the length of the candles after the flame was put off. 6. Record your findings on the chart below. Jars JAR A JAR B Time of the flame was put off Length of the candle after burning Answer the following questions: 1. Which of the 2 jars was the candle's flame put off first? 2. Which of the two candles has the shortest size? 3. What happen, when you cover the Jar A? 4. When the lighted candle in Jar A was covered, the flame was put off, what is the reason why the candle's flame did not continue to burn? 5. What are the 3 main components in combustion? Doss​

most plants cannot survive in saltwater areasbut mangroves thrive in this areas research on how mangroves are able to adpt and live in saltwater areas​

Answer:

Many mangrove species survive by filtering out as much as 90 percent of the salt found in seawater as it enters their roots. Some species excrete salt through glands in their leaves. ... When the leaves drop or the bark sheds, the stored salt goes with them.

Explanation:

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Answer:

Mangroves are unique plants that have adapted to thrive in saltwater areas, where most other plants cannot survive. Here are some key adaptations that allow mangroves to live in these challenging environments:

1. Salt Excretion: Mangroves have specialized cells in their leaves that actively remove salt from their tissues. This process, known as salt excretion or salt secretion, helps them maintain a proper balance of salt and water.

2. Root Aeration: Mangroves have specialized root systems that allow them to obtain oxygen even in waterlogged, anaerobic soils. They have above-ground roots called pneumatophores or "breathing roots" that protrude from the mud and take in oxygen from the air.

3. Tolerance to Variable Salinity: Mangroves can tolerate a wide range of salinity levels, from freshwater to highly saline conditions. They have mechanisms to regulate the concentration of salt in their tissues, enabling them to survive in fluctuating saltwater environments.

4. Filtering and Exclusion: Mangroves have the ability to filter out salt from the water they take up through their roots. They have specialized membranes and tissues that prevent excessive salt from entering their systems.

5. Nutrient Adaptations: Mangroves have adapted to nutrient-poor soils by developing specialized root structures called "prop roots" that anchor them in the muddy substrate and help trap organic matter and nutrients.