Muscle cells and nerve cells in one species of animal owe their differences in structure to

Different genes being expressed.

Explanation:

The differences in the structure of the muscle and the nerve cells is due to the gene expression or gene expressed in the cell and the gene silenced to achieve the desired organisation of cells.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

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-lavira: )

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.