Which of the following causes the change from day to night?

Which part of cellular respiration must occur before any of the other steps can occur

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)