All humans belong to the same species.
a. true
b. false
Ans: a. true
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Suppose that in DNA sequence comparisons of a homologous region in various species, the region shows a low level of polymorphism. What could account for this?
What will be an ideal response?
Which of the following statements concerning rubella immunization is correct?
A. A pregnant woman who contracts rubella should be immunized to protect her unborn child. B. The rubella vaccine given in childhood can protect both the child and any children that she may bear in the future. C. A child born with congenital rubella may be immunized to prevent recurrence of the disease. D. Administration of the rubella vaccine at 12 to 15 months of age is good protection against congenital rubella.
More sparse urban settlement patterns may help conserve energy and preserve the environment.
a. true b. false
In ________ reactions, the products contain more energy than the reactants.
Fill in the blank(s) with the appropriate word(s).