Task:

Load the Frog dataset from "frog/data/frog_256x256x44_uint8.raw", the information about this dataset:
Frog
Description: MRI scan of a frog as part of the Whole Frog Project.
Data Type: uint8
Data Byte Order: little Endian
Data Spacing: 0.5x0.5x1
Data Extent: 256x256x44
Data loading is very important, make sure you correctly load the dataset according to their features.

Visualize the anatomical structures:
1. Apply volume rendering with appropriate transfer function for tissue differentiation
2. Create isosurfaces at two different density values to show different tissue types
3. Use contrasting colors for different structures (e.g., red for soft tissue, white for dense material)

Please think step by step and make sure to fulfill all the visualization goals mentioned above.

Finally, save the paraview state as "frog/results/frog.pvsm"