Earths scientists think that caused significant climate change in the past. a humans b polar ice caps c global warming d plate tectonics

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above