Answer:
These homologous structure indicates a common ancestry
Explanation:
When 4 organisms show homologous structures, they indicates they belongs to a common ancestor from where the changes takes place in them.
The organs which are structurally dissimilar but functionally same are called as homologous organism.
Answer:
Unicellular
Explanation:
Some organisms are microscopic and consist of only 1 cell
decomposers break down dead things and waste, so I would say that dead animals would not go back into the ground as fast and the nutrients would not go back into the cycle