In the diagram of a root tip shown above, the item labeled "2" is the
a. quiescent center.
b. zone of cell division.
c. zone of elongation.
d. root cap.
e. zone of maturation.
B
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The snail-shaped _______________ transduces sound into nerve impulses.
A. vestibule B. malleus C. utricle D. cochlea E. incus
An autotriploid may arise when three sperm cells are involved in fertilization of a single egg
Indicate whether the statement is true or false
Which of these lists contains the four postulates of natural selection?
A. Variation in population, heritable variation, selection, unlimited survival and reproduction B. Uniform population, heritable traits, selection, differential survival or reproduction C. Variation in population, environmental variation, selection, differential survival or reproduction D. Variation in population, heritable variation, selection, differential survival or reproduction
The embryo of a ________ undergoes direct development
A) snake B) frog C) lobster D) butterfly E) dragonfly