________ predict what happens, while ________ explain how and why something occurs
A) Observations; conclusions
B) Theories; laws
C) Observations; hypotheses
D) Laws; theories
E) Hypotheses; conclusions
Answer: D
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Population size declines when ________
a. the sum of births and immigration is less than the sum of deaths and emigration b. death rates are higher than birth rates c. immigration is higher than emigration d. the value for r is greater than 0
The plants and animals now present on acreage from
which the trees were removed ten years earlier represent a. primary succession. b. a climax forest. c. pioneer species. d. secondary succession. e. species introductions.
To answer the following questions, refer to the five items listed below:
A. The function of these is to cut apart foreign DNA molecules. B. The combination of a foreign piece of DNA with the DNA of another organism. C. The pieces of DNA that are moved by a genetic engineer from one organism to another are first incorporated into these. D. These are bacterial populations containing thousands or millions of identical copies of one to several genes. E.
The structures that catch the oocyte upon ovulation are the _____
Fill in the blank(s) with the appropriate word(s).