All scientific must be based on careful and rational examinations of the facts. hypothesis laws theories inquiries

Answer;

Theories

All scientific theories must be based on careful and rational examinations of the facts.

Explanation;

-A scientific theory is a series of statements about the causal elements for observed phenomena. A critical component of a scientific theory is that it provides explanations and predictions that can be tested.

-A good scientific theory is formed from a number of hypotheses that can be tested independently. It should also consists of a limited number of problem-solving strategies that can be applied to a wide range of scientific circumstances.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.