<span>It's a proposition which states that the two species competing for the same resources cannot coexist if other ecological factors are constant. When one species has even the slightest advantage. One of them will always overcome the other one which will eventually lead to extinction of the other one.
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A confounding variable refers to an external effect, which modifies the influence of an independent and dependent variable. This extraneous effect is used to affect the outcome of an experimental design. The confounding variables can ruin the experiment and can generate unnecessary outcomes.
In the given case, confounding variables can be introduced by testing multiple hypotheses at a time and by using distinct kinds of soil in each of the samples.
Answer: mode of reproduction
Explanation: Phylum pteridophyte are vascular plants this means they are plants that possess xylem and phloem tissues. Phylum pteridophyte reproduce and disperse by spores. The dominant phase in pteridophyte is sporophyte.
Phylum bryophyte lack true roots and they are non-vascular plants (no xylem and phloem tissues). They reproduce via gamates, the dominant reproductive phase in bryophyte is gametophyte.
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Experiential evidence is the actual basis for scientific
explanation. Any scientific explanation has to be supported by proper
experimental evidence; otherwise the scientific explanation is not given
importance. Basically the experiment has to be done with proper reasoning to
make the scientific explanation satisfactory for all concerned. Scientific
method is a process that is ongoing. Based on the observations via properly
done experiments, a scientist can come to a proper conclusion. Although the
procedures followed during experiment may vary, but the final result should
always be the same.