In this lesson, our instructor Bryan Cardella gives an introduction on biological diversity. He discusses the kinds of diversity and explains an overview on species. He then moves on to talk about domains, evolution of life, natural selection, migration and genetic drift, competition and niches, symbiosis, geography's effect on biology, biomes, patterns of evolution, and invasive species and biological invasions.
Biological diversity is impacted by number of species and population sizes in a given area. It is valued for its utilitarian, public-service, ecological, and moral value (among other reasons)
The types of diversity include genetic, habitat, and species diversity
The total number of named species is approximately 1.5 million but the total number of actual species on Earth may be up to 100 million unique species.
There are 3 domains that contain all life on Earth: Archaea, Bacteria, and Eukarya
Biological evolution changes life over the eons, mutations are changes in DNA that affect genotypes and fitness, and natural selection involves certain physical traits being favored in the environment over others
Natural selection is affected by: inheritance of genes from the previous generation, environmental variability, differential reproduction, and influence of the environment on survival
Migration, adaptive radiation, genetic drift, and the founder effect have an impact on the evolution of populations over time
An ecological niche describes a species’ role in an ecosystem and the competitive exclusion principle states that no two species can successfully occupy the same niche in the same area at the same time
Symbiosis is when two species have a direct relationship with each other (mutualism, commensalism, or parasitism)
Biogeography and biotic provinces deal with the trend of particular species or types of life forms and their geographic locations
Biomes are types of ecosystems and they are affected by latitude, altitude, precipitation, and temperature
Divergent and convergent evolution are two common patterns of evolution over time
Invasive species and biological invasions can have huge impacts on native flora and fauna
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
This book includes a comprehensive review of the key AP Environmental Science concepts and targeted strategies for acing every section of the exam. Additionally, the book includes two full length practice tests with full answer explanations.
This book is an updated manual that offers a brand-new diagnostic test to pinpoint the test taker's strengths and weak areas, two full-length practice exams with all questions answered and explained, a detailed review of all test topics, supplemented with practice questions and quizzes with answers, an overview of the test plus helpful test-taking strategies, and hundreds of diagrams and illustrations .