Answer:
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The correct answer is d. By causing movement of the organism.
Cilia, flagella and pseudopodia are structures used for movement and/or getting food. Cilia and flagella are very similar in structure with the difference in their length (cilia-short flagella-long and how many of them are found on cells (cells usually have hundreds of cilia while cells with flagella usually only have one or two of them). Pseudopodia is a cytoplasmic extension with the same function as cilia and flagella.
The answer to this would be layer D because temperatures in the mantle range from 500-900 degrees celsius