Why do you think it might be primarily mammals that evolved gaits (such as the bound) that involved dorsoventral (versus lateral) flexion of the backbone?
What will be an ideal response?
Mammals have lost their lumbar ribs. Thus they can flex this part of their backbone without the ribs interfering with each other.
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Is the statement, "In most biology experiments, the relationship between the independent and the dependent variable can best be described as cause and effect," true or false? Explain your answer
What will be an ideal response?
_____ is a state of high metabolic activity in which the cell does most of its growing.
A. Prophase B. Metaphase C. Anaphase D. Telophase E. Interphase
The atrioventricular bundle (of His) originates at the sinoatrial node.
a. true b. false
What fetal structures aid in by-passing the pulmonary circuit?
A. Ductus arteriosus B. Umbilical veins C. Foramen ovale D. Both foramen ovale and ductus arteriosus