They are more similar then different. Animal and plant cells have some of the same cell components in common including a nucleus, Golgi complex, endoplasmic reticulum, ribosomes, mitochondria, peroxisomes, cytoskeleton, and cell (plasma) membrane. The main difference is that plant cells have a cell wall while animal cells only have a cell membrane. In addition, plant cells preform photosynthesis, while animal cells preform cellular respiration.
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Circadian rhythms ....its just behavior that is repeated over 24 hours
It took BP 87 days to stop the flow of oil they monitor it for 48 hours to make sure it was going to hold