In the human body, organ systems interact in order to maintain homeostasis. Which list below represents one organ system from most complex to least complex?

Small intestines, epithelial cells, smooth muscle cells, digestive system

Muscle cell, cardiac muscle tissue, heart, circulatory system

Nervous system, brain, nervous tissue, neurons

Excretory system, kidneys, epithelial cells, urinary bladder

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The third stage of cellular respiration is (2 points)

Isotopes of the same element have differ in their

Refer to this portion of a dichotomous key for fish identification to answer the question. 1. (a) has a single dorsal fin ® 5 (b) has a double dorsal fin ® 2 2. (a) one fin is spiny, the other is smooth ® 3 (b) one fin is not spiny or smooth ® 4 5. (a) has small fin on back near tail ® 6 (b) has no fin on back near tail ® 7 6. (a) has barbs near the mouth ® catfish (b) does not have barbs near the mouth ® 10 7. (a) tail is asymmetrical ® 8 (b) tail is symmetrical ® 9 10. (a) scales are small ® trout (b) scales are large ® whitefish what is the next step to complete to identify a fish that has a single dorsal fin, no fin on the back near the tail, and no barbs near the mouth? step 2 step 5 step 7 step 10