Less-developed countries may be characterized by:
a. low fertility rates.
b. high GNI PPPs.
c. low doubling times.
d. high use of contraception.
e. high infant mortality rates
E
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Activation energy is not required for nonspontaneous reactions
Indicate whether the statement is true or false.
According to the __________, the universe formed about 13 to 15 billion years ago and is still
expanding. Fill in the blank(s) with the appropriate word(s).
An unrooted tree containing four unrelated species can become rooted by adding ________.
A. an unrelated outgroup B. a descendant related to only one of the species C. a distantly related outgroup D. a descendant group related to two of the species
The earliest group of land animals was the
A) protists. B) lobefins. C) arthropods. D) lungfish. E) amphibians.