sunlight reaches the bottom

No, the milkweed plant is not a monocot. The plant in question (Asclepias) instead numbers among the world's dicot. It produces two seed leaves, not one, and therefore receives the dicotyledon, not the monocotyledon, classification.

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Tadpoles eat microscopic aquatic "plants" called phytoplankton.

Freshwater plants can be found in pond, lakes, streams, rivers, and wetlands. Freshwater plants can not live in salt concentrated waters. Some examples of freshwater plants include the water-chestnut, the water lily, and the floating heart.

There are three distinct groups of aquatic plants. The totally submerged plants such as marine kelp are consider true aquatic plants. There are plants like Duckworth that float on the surface of the water or water lilies that are rooted but their leaves float on the surface. The last group are only partially submerged like reeds, they are the most similar to the total land based plants.

North America is the range in which milkweed plants live. The plants in question may be found in Canada, Mexico, and the United States since the genus Asclepias includes a number of species. It therefore supplies its major beneficial insect, Monarch butterflies (Danaus plexippus), with non-toxic nectar and pollen throughout the lepidopteran's yearly migrations.

To ensure that the plant is bouyant and floats on or near the surface of the water.

The air spaces also allow more gas exchange/ or diffusion for the plant to get the needed air that isn't as available in the water.

bog cranberries, lemon grass, check fishpondinfo.com for even more edible aquatic plants.

Because the water keeps the plant cool so the sun won't over-heat the stomata like a regular plant on land.

the fish will die . because the fish needed by theplants which qive oxygen .. !

Well, I'd say there are three types of pollutants we should look at here; toxic substances, artificial fertilisers and warm water. Although warm water is not a pollutant as such, I think it will be useful as a concious raiser that environmental damage is not only caused by harmful substances. If you do not wish to read about the impact of warm water on the environment, you should finish reading at the beginning of that section (I will put it last).

First, the common pollutants; toxic chemicals; harmful, decaying biological matter; and other substances. These substances release chemicals into water which will eventually make their way into the food chain. Now, we must not be hasty and say 'I saw someone throwing a barrel/drum full of dirty water into the canal the other day. I think this will cause the death of many local fish' because it is not necessarily so. In reality, when the dirty water is poured into the canal, it is already around, say, 20% pollutant, 80% water. As the chemicals diffuse, the impact will be that the concentration of pollutants in the canal will only rise by a fraction of a single percent. Any fish will be relatively unaffected by the selfish actions of this one person. Over time, the concentration will further reduce as the pollutants make their way downstream to the sea. However, damage will be done. Say if we were to measure the quantity of pollutant taken up by the algae is 1mg per plant, and a fish eats many of these in its lifetime, it may itself be consumed by a larger fish, with a higher dose of the pollutant than the algae, say 50mg, then the big fish may have a dose of 300mg. Note that the dose is not large enough to kill it, but with each step in the food chain, there will be more pollutant. Eventually the dose will be high enough to eat it, and that may be the point at which the human eats it. Pollutants may not have a particularly large effect on the aquatic world because the volume of water diffuses the pollutant to lower the concentration so that there is little effect except far up the food chain. However, the more pollution there is, the further down the food chain the animals will be dying off.

Many fertilisers are based on ammonium because it has a high nitrogen content. This means that any animals which come into contact with it will die with small doses (ammonia is very poisonous). But not all fertilisers are. In case you're wondering how the fertilisers got there in the first place, fertilisers are used on farmers' fields, which are often located near to rivers and streams as this land is more fertile. When it rains, the fertilisers in the soil are washed into the river. Fertilisers encourage the growth of algae. Algae form often on the surface of the water, and not all fish eat algae. Because less sunlight gets through, other plants are not able to photosynthesise as well, so they don't grow as fast, which may mean that there isn't enough for the fish. At night, the algae respire more than they photosynthesise, which decreases the concentration of oxygen in the water, which causes animals to die.

The final pollutant is warm water. The solubility of oxygen (the amount which dissolves in water) decreases as temperature increases. Cold water is more oxygen rich (usually). Therefore, although the water is usually clean, factories dumping warm water into waterways are causing a lot of damage as there may not be enough oxygen for the fish to respire, and they would die. Therefore, warm water is as dangerous as toxic chemicals to our aquatic ecosystems.

compressibility

Aquatic plants have adapted to life in the water by forming broader leaves with greater surface area to make up for having as many leaves. Additionally, they have formed extremely long stems, allowing them to still root, but reach the sunlight above.

they breath throught the tiny toes on the ens of their foot

Flowers, leaves, roots, and stems are ways in which pond weed is adapted to live in a pond. The flowers grow at the top to facilitate seed dispersal, the leaves have a surface which handles filtered light for photosynthesis, the roots manage to survive 24-7 moisture -- which many plants dislike -- , and the stems perfect flexibility to move with currents. The stems in fact serve to epitomize the adaptation since on land their flexible, go-with-the-flow structure would lead them to unproductively splatter all over the ground.

Mosquito larvae breathe using the respiratory tube i.e, siphon present at the end of the last abdominal segment.

Experiments have proven that plants grow taller and faster and healthier when watered with warm water. Room temperature to 70 degree F is the ideal temperature for plants. Cold water slows plant metabolism and leads to shorter and slower growth in plants

monkeys,giant pandas,ecosystem

Sedge is an emergent plant. These types of plants grow in shallow water. Cattails, arrowheads, rushes, and reeds are also emergent plants.