Ecosystem-based timber harvesting uses methods that -based timber harvesting uses methods that very popular with timber companieshave the greatest impacts on forest ecosystemsleave seed-producing or mature trees uncut to provide for future forestsare ecologically harmlessare the most cost efficient in the short term

leave seed-producing or mature trees uncut to provide for future forests

Explanation:

when this method is used there will be continuous propagation of forest trees for future use because if matured of seed bearing trees are cut there will not be propagation and hence no future trees.

according to classical republican political theory, which democratic republics would function best?

a.   small republics, with people who had similar interests

b.   large republics, with people who had competing interests

c.   republics made up entirely of landowners

d.   republics made up entirely of servants

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.