Site of embryonic and fetal development and of exchange between the maternal and embryonic/fetal bloodstreams.

Female reproductive stem cells.

Rapid burial and high biodiversity in the paleoenvironment of the Miguasha delta provided a good environment for fossils to form.

Site of sperm deposition.

 A single, donut shaped gland in males about the size of a peach pit.  It encircles the urethra.  Secretions activate sperm and account for approximately 20-30% of the semen volume.

Match the adaptation with the benefit it provided.

Use this figure to answer the following question. According to this phylogenetic tree, which of the following features are plesiomorphic traits to the Sarcopterygii clade? Select all that apply.

Why might jaws have been advantageous for early gnathostomes?

Use this figure to answer the following question. According to this phylogenetic tree, what is the sister group to Archosauria?

Explain why this shark is not directly attacking the bits of prey. What sense is it using to detect the prey and what sense is it NOT using?