The major relay center of the brain is the
a. cerebrum.
b. olfactory area.
c. cerebellum.
d. thalamus.
e. hypothalamus
D
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Ancestors of the Galàpagos finches had two different types of seeds to eat on some islands. Some seeds were very small, and required small beaks to handle, other seeds were very large and required large strong beaks to crack. This led to among the Galàpagos finches.
A. disruptive selection B. stabilizing selection C. directional selection D. sexual selection E. artificial selection
________ is a beneficial relationship similar to mutualism, in which the relationship is not obligatory.
Fill in the blank(s) with the appropriate word(s).
What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract
B) To move food along the digestive tract
C) To secrete digestive enzymes into the digestive tract
D) To secrete water into the digestive tract
Selective breeding has been used for centuries to ________
A) remove favorable traits from plants and animals B) enhance growth and yield from domesticated plants and animals C) train crops to grow in more favorable environments D) ensure purity of genetic lines