<span>There are several mechanisms that might explain this result. The key fact is that insect species vary with respect to whether they are beneficial or detrimental to blueberry plants. If the species which experienced decline were directly beneficial to blueberry production, by aiding pollination for example, then their decline would hamper blueberry production. It could also be the case that detrimental species were not affected, or that detrimental species flourished because predators or rivals were eliminated.</span>
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As the angle of impact changes, so does the appearance of the resulting stain. A blood drop striking a smooth surface at a 90° angle will result in an almost circular stain; there is little elongation, and the spines and satellites are fairly evenly distributed around the outside of the drop.
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Primary producers—plants, algae, and bacteria—make up the base of the pyramid, the first trophic level. Through a process called photosynthesis, producers capture energy from the sun and use it to create simple organic molecules, which they use for food. Consumers constitute the upper trophic levels.
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