Which of the following groups would an animal with an exoskeleton, segmented body, and jointed appendages belong to a) mollusks b) segmented worms c) cnidarians d) arthropods

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

Compare the composition of the moon's surface with the composition of the earth's surface.

The big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old