https://www.khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:traits-and-the-environment/x6eddf2e1c524bf5a:traits-and-fitness/a/traits-and-fitness-tx 2026-06-30T17:20:49.845080165Z Learn and try: Traits and fitness Learn what traits are, how inherited traits create variation within a population, and how fitness relates to survival and reproduction. article https://www.khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:traits-and-the-environment/x6eddf2e1c524bf5a:traits-and-fitness/e/understand-traits-and-fitness 2026-06-30T17:20:49.845080165Z Understand: Traits and fitness Check your understanding of inherited traits, acquired traits, learned behaviors, and fitness in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:traits-and-the-environment/x6eddf2e1c524bf5a:traits-and-fitness/e/apply-traits-and-fitness 2026-06-30T17:20:49.845080165Z Apply: Traits and fitness Apply your understanding of inherited traits, acquired traits, learned behaviors, and fitness in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise