Download A Closer Look at Living Things (Introduction to Biology) by Michael Anderson PDF

By Michael Anderson

Existence is available in all shapes and types, and residing entities stay in all kinds of habitats. There are seven features that every one lifestyles varieties sharethe skill to maneuver, to experience, to breathe, to eat nutrients, to develop, to breed, and to excrete waste topic. whole with annotated illustrations that make clear advanced buildings and lifestyles approaches, this quantity surveys the components, features, and classifications of assorted dwelling issues and explores the evolution of existence more often than not.

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Human beings—like most other animals, fungi, protists, and bacteria—are heterotrophs. How Algae and Plants Obtain Food All living things either make their food or get it ready-made. The single-celled alga Protococcus uses both methods. It uses photosynthesis to manufacture food from water and carbon dioxide. The process requires energy, which it obtains from sunlight. After several steps the food-making process results in a kind of sugar called glucose. This sugar is 37 A Closer look At living things An oak tree covered by a thin, green layer of Protococcus.

Finally, Protococcus may combine atoms from glucose with some ready-made food combinations in the dissolved minerals. In this way it builds up protoplasm and cellulose. 38 nutrition And energy ProduCtion Plants also make glucose via photosynthesis. In doing so, however, they use many different cells, tissues, and organs, such as leaves, roots, and sap-carrying channels in the stem. How Animals Obtain Food Although many animals are green, animals do not contain chlorophyll. Therefore they A giraffe nibbling on treetop greenery gets nutrition from the glucose produced by the tree through photosynthesis.

The variety of ecological niches populated on Earth is quite remarkable. Even wet A young spinner dolphin swims with its mother in the Red Sea. Their streamlined shape mimicks that of other sea animals in an example of convergent evolution. com 49 A Closer look At living things A red “eye” spot, as seen near the upper left end of this Euglena spirogyra specimen, is an evolutionary trait that has developed independently in protists and animals alike. Wim van Egmond/Visuals Unlimited/ Getty Images cracks in granite are alive with “rock eating” bacteria.

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