Which statement describes a difference between a jellyfish and a frog? a jellyfish lacks vertebrae, whereas a frog has a spinal cord. a jellyfish cannot reproduce sexually, but a frog can. a jellyfish makes its own food, whereas a frog is a heterotroph. a jellyfish is a prokaryote, whereas a frog is a eukaryote.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)