Platyhelminthes can live without a circulatory or respiratory system because
A) They rely on their digestive system.
B) They are dorsoventrally flattened.
C) The kidney excretes excess waste materials.
D) The epidermis secretes lubricants.
Answer: B
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When the membrane potential is +15 mV, that portion of the membrane
a. is at the normal resting potential b. has a positively-charged inside border c. is more permeable to Ca2+ than normal d. is in the after hyperpolarization phase of an action potential e. is in a hyperpolarized state
Explain how potential energy differs from kinetic energy
What will be an ideal response?
Which space associated with the spinal cord meninges contains areolar connective tissue, blood vessels, and adipose connective tissue?
A. Central canal B. Subarachnoid space C. Subdural space D. Epiarachnoid space E. Epidural space
Deoxygenated blood is returned to the right side of the heart by the:
A) superior and inferior vena cavae B) pulmonary trunk C) aorta D) pulmonary veins E) pulmonary arteries