Final Answer:
The mass balance approach of ecologists is concerned with:
b) Specifying connections and element transfers.
Step-by-step explanation:
The mass balance approach in ecology involves quantifying and understanding the flows of energy and matter within ecosystems. This approach focuses on specifying connections and transfers of elements such as carbon, nitrogen, and phosphorus within ecological systems.
Ecologists employing the mass balance approach aim to study the inputs, outputs, and internal cycling of elements to better understand the functioning of ecosystems. This involves tracking how elements move through different components of the ecosystem, including living organisms, soil, and water.
While natural delineation (Option a) and elements (Option c) are relevant to ecological studies, the mass balance approach primarily emphasizes the quantification and understanding of connections and transfers of elements within ecosystems.