What unique feature do all echinoderms have?
a. Water vascular system
b. An expelling stomach
c. A complex chewing jaws
d. Brains
ANS: A
All echinoderms use a complex system of tube feet and canals filled with water. It is used for
locomotion and feeding processes. Information can be found in the section Advanced Invertebrates
Have Complex Bodies and Internal Systems.
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Indicate whether the statement is true or false.
The principle of cross-cutting relationship states that:
a) the older layers in an undeformed sedimentary rock sequence will be at or near the bottom of the sequence b) all sedimentary rock layers were originally horizontal c) if fragments of rock "A" is found within rock "B", then rock "A" is older than rock "B" d) all sedimentary rock layers originally extended in all directions e) if a sequence of sedimentary rock is disrupted by a fault or an igneous intrusion, then the fault or the igneous intrusion is younger than the disrupted layers
Which of the following characterizes the history of impacts on Earth as deduced by impact history on other terrestrial planets?
A) Impact rates were very high in the early history of the earth, but dropped off after about the first 1 billion years of Earth history to a nearly constant rate since that time. B) Impacts were more intense in the early history of the earth but have continued at about half the rate of bombardment since about 4.4 billion years ago. C) Impacts continued at a fairly constant rate throughout the 4.5 billion year history of the solar system. D) All major impacts occurred in the first 100 million years after the solar system formed.
Floods that develop rapidly with little or no advance warning are called ____ floods
a. rapid b. sudden c. storm d. thunderstorm e. flash