Fitter individuals have an altered some of the environmental advantage and will reproduce factors that were formerly unique to more successfully than individuals different human populations? who are less fit. Human impact has increased the rate at The offspring of fitter individuals which some mass extinctions have may inherit the genes that give occurred on a global scale. that advantage. Theory of knowledge: This natural selection will contribute to the evolution of biodiversity over time. The theory of evolution by natural Environmental change gives new selection tells us that change in challenges to species: those that are populations is achieved through the will survive, and those that are not process of natural selection—is there a suited will not survive. difference between a convincing theory Speciation is the formation of new and a correct one? species when populations of a species become isolated and evolve differently Connections: from other populations. Isolation of populations can be caused by ESS: Biomes, zonation and succession environmental changes forming barriers (2.4); climate change—causes and such as mountain formation, changes in impacts (7.2) rivers, sea level change, climatic change Diploma Program: Biology (topic 5) or plate movements. The surface of the Earth is divided into crustal, tectonic plates that have moved throughout geological time. This has led to the creation of both land bridges and physical barriers with evolutionary consequences. The distribution of continents has also caused climatic variations and variation in food supply, both contributing to evolution. Mass extinctions of the past have been caused by various factors, such as tectonic plate movements, super-volcanic eruption, climatic changes (including
Fitter individuals have an advantage and will reproduce more successfully than individuals who are less fit. The offspring of fitter individuals may inherit the genes that give that advantage. This natural selection will contribute to the evolution of biodiversity over time. Environmental change gives new challenges to species: those that are will survive, and those that are not suited will not survive. Speciation is the formation of new species when populations of a species become isolated and evolve differently from other populations. Isolation of populations can be caused by environmental changes forming barriers such as mountain formation, changes in rivers, sea level change, climatic change or plate movements. The surface of the Earth is divided into crustal, tectonic plates that have moved throughout geological time. This has led to the creation of both land bridges and physical barriers with evolutionary consequences. The distribution of continents has also caused climatic variations and variation in food supply, both contributing to evolution. Mass extinctions of the past have been caused by various factors, such as tectonic plate movements, super-volcanic eruption, climatic changes (including altered some of the environmental factors that were formerly unique to different human populations? Human impact has increased the rate at which some mass extinctions have occurred on a global scale. Theory of knowledge: The theory of evolution by natural selection tells us that change in populations is achieved through the process of natural selection—is there a difference between a convincing theory and a correct one? Connections: ESS: Biomes, zonation and succession (2.4); climate change—causes and impacts (7.2) Diploma Program: Biology (topic 5)
IB_Environmental_Systems_and_Societies_2016.docx