Identify the morphological characteristics shared by all groups in the phylum Echinodermata. Define the distinguishing characteristics of chordates and vertebrates, and contrast them with the characteristics of other animal phyla. Explain how the duplication of Hox genes and Hox gene complexes relates to the evolution of novel characteristics and new body plans in vertebrates.

What are some theories about who Neanderthals were? What is their relationship to modern humans? What do genetic studies tell us about these questions? Together with an Asian people known as Denisovans, Neanderthals are our closest ancient human relatives. Scientific evidence suggests our two species shared a common ancestor. Current evidence from both fossils and DNA […]

What characteristics would lead a provider to suspect domestic violence, child abuse, or elder abuse is taking place within a family? Discuss your facility’s procedure for reporting these types of abuse.

What is the role of the haversian canal, osteocyte and canaliculi in keeping osteocytes alive despite being surrounded by bone How do canaliculi help osteocytes survive? By means of these canaliculi, nutrients and waste products are exchanged to maintain the viability of the osteocyte. Osteocytes are the most abundant type of cell in mature bone tissue. […]