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Build an ecological pyramid using the examples of some terrestrial ecosystems. What is the last level of biomass for this pyramid when the biomass of the producers is 1000 kg?
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The last level of biomass is kg.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.