Echinoderms come from the words echinos and derma. Echinos means thorn, derma means skin. Thus, echinoderms are animals that have spines on their […]

A complete explanation of what xylem is, starting from its definition, function, characteristics, tissue structure, and its constituent components in […]

A complete explanation of what sensory and motor neuron cells are, starting from their understanding, function, structure, types, parts, pictures, […]