One of the scientists in the video compared ice cores to rings on a tree. When you look at a cross section of a tree trunk, you can see rings in it. These rings indicate the annual growth cycle of the tree. Counting them reveals how many years
the tree was alive. What did the scientist mean when he said that ice cores are like tree rings?
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just go with your heart buddy

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.