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

I NEED ANSWERS ASAP!

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

Apair of fruit flies reproduces and has 1,000 offspring. all 1,000 of the offspring have the alleles gg. what is the most likely combination of alleles for each parent

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities