Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

By the end of this section, you will be able to:Give examples of how the carrying capacity of a habitat may changeCompare and contrast density-dependent growth regulation and density-independent growth regulation, giving examplesGive examples of exponential and logistic growth in wild animal populationsDescribe how natural selection and environmental adaptation leads to the evolution of particular life-history patterns

This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Adaptability gives species an edge in surviving environmental changes both big and small But how different species adapt together isn’t always clear For instance, how do predator and prey adjust their interactive behavior in the face of climate change? A new predator-prey model provides some clues Researchers looked at how tweaks to offensive and defensive strategies affected predator-prey populations under two types of disturbances -- Short-term perturbations, such as extreme weather events And permanent perturbations, such as climate change They found that fast adaptation can hold population dynamics steady against these disturbances But in some cases, adaptation can worsen the effects of perturbations This finding suggests that understanding perturbation type, target, and strength matters -- Strengthening the need for tailored approaches to ecosystem management in changing environments Raatz et al..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

The computer program's simulation of a Sonoran desert community should ultimately strengthen the student's comprehension of what is required for a natural ecosystem to sustain itself (remain in balance). This computer simulation program has great flexibility. It allows the student to manipulate the population numbers of five Sonoran Desert species. A species natural history attachment provides vital information for the students to familiarize themselves with each species' behaviors, its niche and food resource needs. The program includes two producers, the Saguaro cactus and the Ironwood Tree. It also includes 3 consumers, but their interactions both toward the producers and each other differ. The community's ability to remain in balance and sustain all five species so that none die out rests on the student's assessment skills enabling him to correctly identify these dependencies. The student learns by trial and error as he continues to fine tune the ecosystem that he maintains stewardship of.

This article identifies age-appropriate national science education content standards and curriculum connections for introducing complex concepts contained in Principle 7 of the Essential Principles of Climate Sciences. The principle describes consequences of climate changes on Earth systems and human lives. The content standards will help teachers determine appropriate topics for their students. A number of resources from the online magazine Beyond Weather and the Water Cycle are highlighted for their connection to the science curriculum in the early grades. In addition, the article identifies common misconceptions about weather and the water cycle often held by students.

Rating: Examples of High Quality NGSS Design if Improved

Science Discipline: Life Science

Length: Unit

This middle school unit was designed to support the middle school NGSS related to Ecosystems: Interactions, Energy, and Dynamics integrated with elements of related Earth science NGSS (Human Impact). The unit includes five chapters, each focused on a specific phenomenon related to ecosystem disruption, including questions around the reintroduction of wolves into Yellowstone and the invasion of zebra mussels in the Great Lakes and the Hudson River. © Regents of the University of California

Many factors influence the success and survival rate of a population of living things. Explore several factors that can determine the survival of a population of sheep in this NetLogo model. Start with a model of unlimited grass available to the sheep and watch what happens to the sheep population! Next try to keep the population under control by removing sheep periodically. Change the birthrate, grass regrowth rate, and the amount of energy rabbits get from the grass to keep a stable population.