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Some bacterial organisms are autotrophic, like the plant kingdom. They can also be single-cellular. They both have a cell membrane and some have a cell wall, like plant cells.
There would be an increase in dead matter and a lack of nutrients in the soil.
Decomposers break down dead matter, so without them there will be an increase.
They then return the nutrients from the dead matter to the soil, so there will be a lack of nutrients in the soil.
Examples of decomposers are mushrooms and earthworms.
1) Answer B is correct.
7) I believe that answer B is correct.
24) Answer C is correct. GO PLANTS!! (even though they are boring to learn about).
28) Answer B is correct.
29) I believe the answer is either A or D.
30) Answer B is correct.