In a deciduous forest ecosystem, which of these organisms would be a decomposer?
a) algae
b) lichen
c) mushroom
d) oak tree

In a deciduous forest ecosystem, mushroom would be a decomposer.

A decomposer is an organism that breaks down decaying organic material. Decomposers obtain their energy by ingesting the organic material they are decomposing. Mushroom (a decomposer) is a fungus that release enzymes which decompose dead plants and animals. Mushroom can be found in a deciduous forest ecosystem (an ecosystem that contains mainly broad-leaved trees whose leaves fall during one season).

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: