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acid air mass algae bacteria blood body brain Building Skills called carbon cause cell membrane cell respiration Chapter chemical reaction chlorophyll chromosomes color compounds contain crust disease drawing earth electric current endocrine endocrine system example eyes female flower fungi galaxy gene glaciers glands grow happens hormone kind landforms laser layer lens Lesson 1 Review Lesson Checkup Letter your paper light living things Look magnet male Materials meiosis microbes mid-ocean ridge million mirror mitosis monerans motor mountains move nerve cells Observe ocean offspring one-celled organisms oxygen picture plate pollen pollution potential energy produce protists protozoans Punnett square Questions radio waves radiosonde Record reflecting telescope reproduction rock rocket satellites Science Ideas Science Words scientists sediment seeds shows soil space speed sperm spinal cord stars Step substance tape telescope temperature Think Critically traits vaccine weather wind wire yeast