What information about the Devonian tetrapods leads to the conclusion that tetrapods evolved in the water rather than on land?
What will be an ideal response?
Retention of internal gills and polydactylous feet that look more like flippers than feet for walking on land are characters that suggest an aquatic origin for tetrapods.
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All lymph flows in a one-way system toward the ________
A) spleen B) liver C) heart D) pancreas
Explain the roles of mucus and cilia in the respiratory system
What will be an ideal response?
Circulation to the spleen demonstrates a(n)
A. simple pathway, as one artery delivers blood and one vein drains the organ. B. simple pathway, as its two capillary beds are separated by a portal vein. C. anastomosis, as one artery delivers blood and one vein drains the organ. D. anastomosis, as its two capillary beds are separated by a portal vein.
A chemical reaction that removes electrons from an atom is called a(n) ________ reaction
A) reduction B) condensation C) hydrolysis D) oxidation E) anabolic