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1 1. 2. 3. 4. 5. 6. 7. 8. Basic unit is the cell Reproduce Have DNA Grow & develop Obtain & use energy Respond to their environment Maintain homeostasis AS A GROUP, living things change over time (evolve) 2 3 Cells are the smallest living unit of organisms. Cells are complex and highly organized. Organisms may be composed of a single cell (like bacteria) or many cells (like plants, animals, and fungi). 4 5 Sexual Reproduction Involves 2 parents Egg fertilized by sperm to make a ZYGOTE Offspring DIFFERENT from parents 6 Asexual reproduction Involves a single organism or cell Cell divides Offspring IDENTICAL to parent 7 8 DNA (deoxyribose nucleic acid) carries the genetic code for all organisms All organisms contain DNA DNA codes for the proteins that make up cells & do all the work 9 10 Organisms grow by producing more cells & by cell enlargement Organisms develop as they mature into an adult organism Monarch to chrysalis 11 12 Autotrophs can make their own food Heterotrophs can NOT make their own food These cyanobacteria stromatolites are in 13 halophiles! shark bay, Australia. They are Organisms respond to temperature, water, food supplies, etc. in order to survive & reproduce 14 Keeping the internal environment of the cell or organism within the ranges required for life Stable internal conditions of pH, temperature, water balance, etc. 15 Groups of organisms (not individuals) change over time in order to survive within changing environments. Fossil records show changes in groups of organisms 16 Atoms Molecules Organelles Cells – life starts here Tissues Organs Organ System Organism Population Community Ecosystem biosphere 17 Boston Dynamics 18