Generally, any "thing" has many different qualities. If it shares roughly half these qualities with another "thing" they could be said to be very different and yet similar. <span>In the case of cells, plant cells and animal cells both have a nucleus, protoplasm, vacuoles. Plant cells have cell walls and a more rigid structure</span>
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<span />Cancer is a disease in which abnormal cells divide uncontrollably and destroy body tissue and no it cannot affect unicellular organisms
This is called B. Mutualism. The termite and the wood-digesting protozoa both receive benefits from each other, and therefore are in a "mutual" relationship.
Granite is a softer rock and will easily be weathered. I 50 years it will likley be rough, and perhaps smaller parts of it missing.
The marble is a harder rock and will likely last with a lesser degree of damage for 50 years.