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Answer: The correct answer for the fill in the blank is families.
There are eight hierarchical categories used to classify organisms. Order is one of the hierarchical categories used in classifying organisms. It is subdivided into several families. It means that families occupy lower place in the taxonomic categories.
Example- Grasses belong to the order Poales and it belongs to one of its families, which is called Poaceae.
The answer is that <span>all
veins carry blood back to the heart, except for the pulmonary vein. the
vena cava empty into the right side of the heart, so they technically
bring blood to the
</span>main atrium.
