Q639
Interactions with external factors which influence or cause competitiorr include
A.
Selective pressure or disturbance of ecological equilibria by animals and man
B.
Disturbance of environment which provides bare soil or seedling niches
C.
Unusual soil conditions such as toxic solute content, heavy metals, excess calcium carbonate etc.
D.
All of the above
AnswerAnswer: Option D
Solution
Answer: Option D
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