Questions: What do all the plants, animals, and microscopic organisms of an ecosystem have in common, aside from their physical environment? A. They all require the same resources to survive. B. They all would die if moved to another ecosystem. C. They all have symbiotic relationships with each other. D. They are the biotic elements of the ecosystem.

The answer is the fourth one (or D): They are the biotic elements of the ecosystem.

Explanation for each option:

A. They all require the same resources to survive.

• This is incorrect because different organisms within an ecosystem have different needs and niches. For example, plants require sunlight, water, and nutrients from the soil, while animals may need food, water, and shelter. Microscopic organisms might need specific conditions like moisture or organic matter.

B. They all would die if moved to another ecosystem.

• This is incorrect because some organisms can adapt to new environments or may even thrive in different ecosystems. While some species are highly specialized and may not survive outside their native ecosystem, others are more adaptable.

C. They all have symbiotic relationships with each other.

• This is incorrect because not all organisms in an ecosystem have symbiotic relationships. While many do engage in symbiosis (mutualism, commensalism, or parasitism), others may interact in different ways, such as through predation or competition.

D. They are the biotic elements of the ecosystem.

• This is correct because all plants, animals, and microscopic organisms are considered the living, or biotic, components of an ecosystem. The biotic elements interact with each other and with the abiotic (non-living) elements like water, soil, and climate.

Summary: The commonality among all plants, animals, and microscopic organisms in an ecosystem, aside from their physical environment, is that they are the biotic elements of the ecosystem.