CK12 Life Science

Points to Consider A healthy reproductive system is important if you plan to have children when you are older. The birth of chi ...

(14) Ndraka – fotolia.com.http://us.fotolia.com/id/7030858. Royalty Free. (15) [Dreamstime.com; image ID #41640398,Image: AliceH ...

Chapter 23 From Populations to the Biosphere 23.1 Lesson 23.1: Introduction to Ecology Lesson Objectives Define what ecology is ...

What is Ecology? Ecologyis the scientific study of how living organisms interact with each other and with their environment. Bec ...

Ecological principles can be studied in the laboratory as well. Perhaps you can think of some ways in which some aspects of ecol ...

Table 23.1: (continued) Level Definition ecosystem a natural unit composed of all the living forms in an area, functioning toget ...

Figure 23.2: The “global biosphere,” which includes all areas that contain life, from the sea to the atmosphere. ( 1 ) Figure 23 ...

Review Questions What are three ways of sub-dividing the study of ecology? Give an example of each. Name four types of research ...

ecosystem A natural unit composed of all the living forms in an area, functioning together with all the abiotic components of th ...

same species form an interbreeding unit. Ecologists who study populations determine how healthy or stable they are and how they ...

Figure 23.5: A population of cacti in the Sonoran Desert generally shows uniform (even) dispersion due to competition for water. ...

Figure 23.6: A hummingbird nest with young illustrates an altricial reproductive strategy, with a few, small eggs, helpless and ...

One type of migration that you are probably pretty familiar with is the direct, often sea- sonal, movement of a species that res ...

Figure 23.9: Growth of populations according to Malthus’ exponential (or J-curve) growth model (left) and Verhulst’s logistic (o ...

Density-dependent factors, such as food supply, promote competition between members of the same population for the same resource ...

We don’t know all the answers yet, but by looking at population growth through history and by examining population growth in dif ...

Figure 23.10: Worldwide human population growth from 10,000 BCE through today ( 9 ) Lesson Summary A population is comprised of ...

What do you think these major advances were? Name some environmental crises that support the idea that our human population has ...

Points to Consider Now that you understand what makes up a population, what do you think makes up a community? You have learned ...

A community may also be defined according to the classification of and the geographic distribution of species, as in an oak-hick ...