Answer the question using the accompanying figure. In the internal leaf structure, the structure labeled "4" is ____
a. a vascular bundle
b. spongy mesophyll
c. epidermis
d. a stoma
e. palisade mesophyll
ANSWER: d
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Describe how scientists use fossil finds and radiometric dating to piece together evolutionary history. Why is this useful when scientists discover a missing link fossil?
What will be an ideal response?
Which brain structure controls the secretion of hormones in the rest of the body?
A. The cerebellum B. The hypothalamus C. The brainstem D. The thalamus
SARS is a form of
a. lung cancer. b. asthma. c. influenza. d. histoplasmosis. e. emphysema.
A woman who is Rh- becomes pregnant by a man who is Rh+. Which statement is true?
a. the baby is always going to be Rhb. there is no chance the fetus will develop hemolytic newborn disease c. the mother’s blood cell’s will contain Rh markers d. the father’s blood will always contain Rh antibodies e. there is a chance the baby will be Rh+