Answer: Because if we assume the cannibal has to fight to the death then the stronger will win and the weaker will die off.
Explanation:

No, the arrangement of vascular bundles in the stem same for all plant species.
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☆ <u>In</u><u> </u><u> Monocot </u><u> </u><u>Stems</u></h2>
In monocots, xylem and phloem are organized in vascular bundles scattered throughout the stem. As the plant grows, monocot stems generate new vascular bundles for the new tissue. Monocot stems in general possess a simpler arrangement than that found in dicots.
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☆ <u>
In Dicots</u>
<u> </u><u>Stems</u></h2>
Within the class of plants known as dicots, herbaceous dicots and woody dicots have different arrangements of vascular tissues. In herbaceous dicots (plants, mostly annuals, with soft, non-woody stems), vascular tissue remains in discrete bundles even at maturity. In contrast, when mature woody dicots (plants, mostly perennials, with woody stems) reach maturity, the vascular bundles join together to form continuous rings around the interior of the stem.
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<em><u>ThankYou</u></em><em><u> </u></em>✔✔</h2>
Correct answer: D). Energy decreases from bottom to top because some is used at each level for life processes.
The pyramid of matter and energy in the ecosystem tells that when energy flows from one trophic level to another trophic level, then some amount of energy is always lost as a heat, which is lost to the atmosphere and it never comes back.
Therefore the primary consumers obtain 10% of energy from the autotrophs and secondary consumers get 1% of energy and that of tertiary consumers get 0.1%. It shows that top consumers receive the least energy. It is also called as10% law.