Which of the following statements describe a compound?
A) A compound is a pure substance.
B) A compound obeys the law of constant composition.
C) both a and b
D) neither a nor b
C
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Explain why heating an air mass causes it to rise
What will be an ideal response?
During the Cambrian, Trilobites developed a flexible exoskeleton which allowed them to ________
A) sink to the bottom of shallow ponds to find food B) avoid being eaten by other creatures C) climb trees and find food D) eat smaller life forms by crushing them in their jaws E) burrow in soft sediment to find food
Answer the following statement(s) true (T) or false (F)
1. A major factor in the decline of the Native American populations after the arrival of Europeans was disease. 2. The economy of the Middle Colonies was characterized by plantation agriculture. 3. The rate of population increase in the United States is similar to that of other materially wealthy countries. 4. Immigrants often have higher birth rates and younger age structures than long-established populations. 5. The primary factor in whether or not immigrants—legal and illegal—come to the United States is legislation.
Describe and discuss the marine communities of the Ordovician, Silurian, and Devonian. How do they compare with
present-day marine communities? What will be an ideal response?