What factor or factors can cause a difference between your observed results and expected results?

Were the deviations (differences between observed and expected) the result of chance, or were they due to other factors. ... The chi-square test is always testing what scientists call the null hypothesis, which states that there is no significant difference between the expected and observed result.

Explanation:

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: