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There are some reasons which could be mentioned:
1)Energy is lost as heat at each feeding level
2)Consumers who feed directly on plants have more energy for themselves than consumers feeding on other consumers. Indeed, energy again is lost in each level.
3)Feeding cattle is not productive, because energy must be transferred from plants to the cattle and then to people.
Upwelling waters occur when the warm water, on the surface of the oceans in the equatorial regions are pushed towards the poles by winds and the denser cold currents on the ocean bottom move up to replace the displaced waters. The denser currents are usually nutrient-filled and are an ideal substrate for growth of phytoplankton as they warm up on the surface. The algae bloom attracts fish and other producers in the sea. The producers consequently attract other carnivorous fish.
The answer is: Ecological Succession
STEPS:
1.) Bare rock (there is no grass at this point).
2.) Lichens (lichens begin to appear).
3.) Small Plants & Lichens (small plants begin to grow & the lichens are spreading).
4.) Grasses (grass starts to grow in certain spots).
5.) Shrubs & Grasses (the grass has covered, at least the majority, of the ground and shrubs begin to appear).
6.) Trees (the shrubs have grown into trees that are tall enough to provide shade)
7.) Animals (the animals return or new animals appear).
The vascular bundle in the shape of a single central cylinder in a root is called the Stele.
- Vascular bundles provide the following purposes: 1. Xylem: It is essential for delivering water-related elements to various areas of the plant. 2. Phloem: This tissue is in charge of delivering nutrients and food to the plant. 3. Cambium: By producing new xylem and phloem, it contributes to secondary growth in plants.
- A group of fundamental tissues found in the stem of a plant that includes cambium, xylem, and phloem. The procambium of the developing stem is where the vascular bundles grow. In the monocotyledons, vascular bundles are scattered throughout the stem in intricate configurations.
- The major vascular system of the plant axis and its accompanying ground tissues make up the plant stele.
To learn more about Vascular bundles.
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