_______________ symmetry is the arrangement of body parts in such a way that any plane passing through the axis divides the body into mirror images. 

Select the following phylum that includes animals that are segmented, bilaterally symmetric, and have a chitinous exoskeleton.

This type of clade consists of the ancestor species and all its descendants.

The scientific name for a red oak is properly written as:

What is correct order of the hierarchical levels of classification of living things starting with most general?

What organism is the example given for an acoelomate?

Animals that possess homologous structures probably :

Formation of a distinct head is called 

 The common ancestor shared by mouse and gorilla is at point ______ on the phylogeny shown.

The very broad field of study of animals is