the first animals to live successfully on land were
a. reptiles.
b. flying reptiles.
c. amphibians.
d. arthropods.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

acceleration = 18/3 = 6 m/s per second.

hope i

-lavira: )