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7th Grade Science
Evolution
2. Mechanisms
2.1 Natural Selection, Survival and reproduction
Natural Selection: How Survival and Reproduction Shape Life on Earth
Discover how inherited traits, environmental pressures, and reproductive success drive the evolution of populations over many generations through the powerful mechanism of natural selection.
What You'll Learn
Natural selection favors organisms with traits aiding survival and reproduction.
Fitness measures how well organisms reproduce within their specific environment.
Adaptations are inherited traits shaped by environmental pressures over generations.
Overproduction creates competition, driving natural selection across entire populations.
What You'll Practice
1
Students analyze camouflage, antibiotic resistance, and giraffe neck examples.
2
Questions test understanding of fitness, variation, heredity, and selective pressure.
3
Learners distinguish natural selection from Lamarckism and artificial selective breeding.
Why This Matters
Understanding natural selection equips students to explain real-world phenomena such as antibiotic resistance, species extinction, and evolutionary change in living populations.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Natural Selection
Evolutionary Fitness
Adaptation
Heredity
Genetic Variation
TX Curriculum Aligned