Which type of null hypothesis is used in the figure below? 
Definitions:
Axopods
Long, filamentous, cytoplasmic projections characteristic of actinopods.
Silica Shells
Rigid, protective, outer coverings made of silica found in certain algae and microscopic aquatic organisms, such as diatoms.
Algal Endosymbionts
Algae living within the cells or body cavities of another organism in a mutualistic relationship, contributing to the host's nutrition, especially in corals and some marine animals.
Rhizarians
A group of mostly unicellular eukaryotes characterized by their amoeba-like movement mechanism, often through pseudopods.
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