What limits organisms from reaching an infinite size within an ecosystem?

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                                          Resources.

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                                        Resources such as food, water, light, space, shelter                                     and access to mates are all limiting factors. If an organism, group or population does not have enough resources to sustain it, individuals will die through starvation, desiccation and stress, or they will fail to produce offspring.

d is the answer

sorry if its wrong!