Which nutrient is synthesized and stored in the liver and muscles of animals and is used as a source of quick energy?
A) Protein B) Fat C) Starch D) Calcium E) Glycogen
E
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Melatonin levels in mammals are regulated by a(n) ____
a. inhibitory pathway b. stimulating pathway c. negative feedback loop d. positive feedback loop e. triggering signal
The C4 photosynthetic pathway is most common in
A) gymnosperm trees. B) angiosperm trees. C) algae, bryophytes, and ferns. D) grasses and shrubs in warm and dry climates.
The metamorphosis of a caterpillar into a butterfly is an example of
A) internal development. B) placental development. C) indirect development. D) direct development. E) external development.
When a pregnant woman ingests toxins such as alcohol and nicotine, the embryo is put at risk because these toxins can
A. diffuse from the mother's blood into the embryo's blood within the placenta B. enter the embryo when it eats C. transfer to the embryo since the mother's blood normally mixes with the embryo's blood in the placenta D. enter the uterus through the mother's navel