Why is a digestive system with a single digestive opening inefficient?
What will be an ideal response?
Since nutrients enter and wastes exit through the same opening, wastes may be taken into the animal's
body only to be expelled again.
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What is the role of cleavage in the early embryo?
A. produce bigger cells B. produce many cells C. extrude polar bodies D. make the embryo larger E. create germ layers
The movement of plates of the Earth's crust is
a. plate tectonics. b. plate dynamics. c. plate mechanics. d. plate kinetics. e. plate motility.
When a woman breast-feeds, oxytocin causes the milk to move from the mammary glands toward the nipples. What other organ might also react when a woman breast-feeds right after giving birth?
A) uterus B) rectum C) thymus D) perilymph
You are growing Bacillus subtilis, an aerobic bacterium that can also carry out fermentation when required, in a bioreactor and notice that the growth rate has slowed and the pH has decreased. You suspect the bacteria are
A) using the Krebs cycle. B) fermenting. C) photosynthesizing. D) using proteins. E) dead.