Which component of the human eye forms the iris?
A) sclera
B) choroid
C) retina
D) pupil
Answer: B
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Mammals appeared 220 million years ago but did not begin to greatly diversify until 65 million years ago. Why is
this? What will be an ideal response?
In the near future, the human population is predicted to involve
A. a worldwide decrease in population growth due to limited resources. B. a continuation of human population growth at the same pace as in the previous century. C. a decrease in growth in most, but not all, more-developed countries and continued growth in most less-developed countries. D. an increase in population growth in all countries in the world.
Development of new vaccines has slowed in recent decades. This is due to
A) the ineffectiveness of vaccines against disease. B) the availability of vaccines against nearly all serious diseases. C) the high cost of development. D) the high level of risk with immunization. E) a lack of need with modern medical treatments.
Trait SpeciesABCDE100100210101310101411100511110611110The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which pair of species shares the fewest number of derived characters (synapomorphies)?
A. 6 and 3 B. 1 and 6 C. 4 and 6 D. 1 and 4 E. 2 and 3