Good Morning Fun Fact: Humans and animals have closed circulatory systems featuring veins and arteries. Insects have open systems with “hemolymph” blood swilling freely about the body.

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.