Answer:
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Explanation:
<span>Trophoblasts
Trophoblasts are cells that make up the external layer of a blastocyst, this is a major source of nutrient for a newly formed organism</span>
Biologist have cataloged many species that determine the allocation opportunities, food,and other resources,both within and between groups, by competition . species compete for resources available in the ecosystem such food and only the strongest only survive and the weak are disadvantaged in the ecosystem
