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What could make the heart rate of the daphnia increase or decrease

What was carolus linnaeus' classification system of organisms based on? a. physical characteristics of organisms b. food habits of organisms c. habitat of organisms d. size of organisms

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid