Stars start as… a. cosmic rays b. chunks of rock c. disks of dust and gas d. ice

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent