What is one important difference between savannas and temperate grasslands?
A) Savannas only rarely experience fires.
B) Temperate grasslands are mostly treeless.
C) Savannas are inhabited by grazing mammals.
D) Temperate grasslands have nutrient-poor soil.
B
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The gaseous hormone that promotes seed germination and stimulates fruit ripening is known as
a. abscisic acid b. propylene c. indoleacetic avid d. ethylene e. brassinolide
A structured procedure for collecting information to test a hypothesis is a(n)
A. principle B. theory C. control D. experiment
Which of these characteristics added most to vertebrate success in relatively dry environments?
A) the shelled, amniotic egg B) the ability to maintain a constant body temperature C) two pairs of appendages D) a four-chambered heart
Emergence of a new species is known as _______.
A. adaptive radiation B. inbreeding C. reproductive isolation D. speciation E. coevolution