Four of the five answers listed below are events that can lead to secondary succession. Select the exception
a. a mudslide that destroys a section of a shrubland
b. torn down buildings leading to vacant lots
c. retreat of a glacier in Alaska
d. a fire
e. hurricane-damaged coastal marshes
c
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Why is a reducing atmosphere conducive to the origin of life?
A. It is more favorable for the development of organic molecules. B. It is rich in free oxygen. C. It is devoid of organic molecules. D. It is very similar to today's atmosphere.
What determines the development of male or female sex organs in the human embryo?
a. environmental factors b. genes on the X chromosome c. genes on the Y chromosome d. genes on both the X and Y chromosomes e. neither the X or the Y chromosomes
The biosphere is so large that, unlike the case of the more simple ecosystems, it is impossible to disturb the balances that exist in this ecosystem
Indicate whether the statement is true or false
When a cell nucleus from an adult organ (eg. heart, muscles) is inserted to another enucleated cell, it gives rise to a new replacement tissue for that organ. This procedure is known as
A) Embryo cloning B) Adult cloning C) Therapeutic cloning D) None of the above