For a scientific theory to be valid, which of the following must be true?
a. it must be well tested.
b. it must be widely accepted.
c. it must explain the observable facts.
d. all of the above

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a. earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c. earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Ture or false evidence for evolution includes millions of fossils

What is the most abundant vertebrate on earth?