Cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells.
which of the following would require this theory to be modified?
a.
the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities.
b.
a survey finds that a majority of people believe viruses carry out the basic processes of life.
c.
scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.
d.
a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets.
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C. Scientific observations show that microscopic organisms living in the deep ocean are not made up of cells

Explanation: The cellular theory says that cells are the structural and functional basic unit of life, that all living organisms are made up of cells and that cells came from other cells. This theory should be modified if there's scientific observations that challenge the postulates: living organisms that were not made up of cells can't have cells as functional and structural units, for example.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.