Final answer:
Fungi and wood-eating beetles in a rotting log ecosystem both function as decomposers by breaking down wood and recycling nutrients.
Step-by-step explanation:
In the rotting log ecosystem, the fungi that grow on dead bark and the beetles that eat wood are alike in that they both play crucial roles as decomposers. Fungi, such as the white-rot fungi, are essential in breaking down complex wood components like cellulose, hemicellulose, and lignin by secreting enzymes. These organisms help recycle nutrients back into the ecosystem. Similarly, wood-eating beetles, such as ambrosia beetles, contribute to the decomposition process by consuming wood and often have symbiotic relationships with fungi that assist in breaking down the wood they ingest.