Which is NOT true about scientific theories? A.
Scientific theories are a set of ideas that tie together many observations.

B.
A scientific theory must change if new observations are made that do not support it.

C.
Scientific theories seek to explain why something occurs in the natural world.

D.
Scientific theories describe how some part of the natural world occurs.

Which statement best represents an economic weakness of the national government under the articles of confederation? a. the national government was unable to collect taxes. b. national and state taxes combined were too high for most services to pay. c. congress set different tax rates for each state, leading to conflict. d. state refused to collect taxes on behalf of the national government