<span>The total pool of energy decreases because some of the energy gained from the layer below will have been expended catching/eating it (You get less total energy as you go up the pyramid.</span>
The answer is TRUE!!!
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Answer: Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. An invasive species can be introduced to a new area via the ballast water of oceangoing ships, intentional and accidental releases of aquaculture species, aquarium specimens or bait, and other means.
Heliotropism (like sunflowers)
