Ascientific theory is proposed after several valid investigations. this makes scientific theories

elaborate descriptions of observations
the most powerful explanation scientists have to offer
unchangeable by other scientists over a period of time
unacceptable to a majority of scientists

the most powerful explanation scientists have to offer

Explanation:

just took it and got it right

answer; round wood logs, building materials like (plywood),also pulp and paper products;

1."lessen the worth of ."

2."increase the worth of."

3." beyond the worth of."

4."against the worth of ."