Ecosystems
7th Grade Science · 11 lessons
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Lessons
- 1Cellular RespirationCellular respiration is how cells release energy from food by combining glucose with oxygen. This process takes place mainly in the mitochondria and produces carbon dioxide and water as waste, along with the energy cells need to work.Lesson
- 2The Cell and Its OrganellesCells are the smallest units of life, and each one contains tiny structures called organelles that carry out specific jobs. The nucleus stores genetic information, the mitochondria release energy, and the cell membrane controls what enters and leaves the cell.Lesson
- 3DNA, Genes, and HeredityDNA is a molecule that carries the coded instructions for building and running a living thing. These instructions are organized into genes, which parents pass on to their offspring, which is why children often resemble their parents.Lesson
- 4Mitosis and Cell DivisionMitosis is the process in which one cell divides to form two identical new cells. It allows living things to grow, replace worn-out cells, and repair damage, such as when new skin cells form to heal a cut.Lesson
- 5Natural Selection and EvolutionNatural selection is the process in which organisms with helpful traits survive and reproduce more successfully than those without them. Over many generations this can lead to evolution, such as when moths with darker wings became common in soot-covered forests.Experiment
- 6Classifying Life into KingdomsScientists classify living things into groups based on shared features, starting with broad kingdoms such as animals, plants, fungi, and bacteria. Every organism also receives a two-part scientific name, like Homo sapiens for humans.Lesson
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