The source of all carbon in living organisms is
A) simple sugars.
B) carbon dioxide from atmosphere and water.
C) carbon-fixing bacteria.
D) sedimentary rocks.
B
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The process of producing NH4+ from decaying organic material is called ____
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
Evolution is defined as a change in allelic frequencies that occurs over time. Knowing this, did you see evolution occur during any of your experiments?
a. yes b. no
When the p53 gene is overexpressed in normal cells, the cells are killed.
Answer the following statement true (T) or false (F)
Identify the biotic factor of an ecosystem among the following options
A) Amount of nitrogen available for the moss to grow on cliffs B) Nesting spots on the edge of a cliff that birds can use C) Average wind forces that the cliffs withstand daily D) Amount of moss available to the consumers