Core Curriculum

Life Science Lessons

Elementary


 
Elementary
The Cycle and Structure of Life
Plants
Animals
Interactions of Life
Living and Nonliving Connections...Civilizations across time have investigated livings things. They have attempted to understand how and where they live, how they relate to each other, and how they behave. Scientists now recognize that living organisms are dependent on both the nonliving and living features of a habitat. The elements around us, such as trees, soil, water, and air, form all living organisms. Some of these primary components include nitrogen, oxygen, carbon, and phosphorus. All of these are recyclable and constantly interchange between living and nonliving entities. All life begins with energy from the sun. Plants capture the sun's energy and use it to make food. They are the basic food source for all living creatures. Other organisms rely on plants this primary source in different ways, organized in the food chain. These organisms live in all sorts of arrangements, including niches, habitats, ecosystems, which all form the larger arrangements called biomes. Within all these systems, there are producers, those organisms that can photosynthesize, consumers that eat the producers, and decomposers that break down living materials into the original inorganic elements. The world is composed of a hierarchy of environments called biomes. Examples of biomes include forest, desert, grassland, tundra, and mountain, among others. In all these environments, organisms establish themselves as producers, consumers and decomposers. Biomass is the term for plant material or agricultural waste used as a fuel or energy source. It may eventually be used as a fuel source and possibly even replace some fossil fuels.
<<Back
Secondary


 
Middle School Lessons
Zoo Science
Texas Ecology
Animal Classes
Interactions of Life
The Basic Units of Life
The Codebook of Life
Patterns of Change
To Be or Not To Be a Cell
The Multicellular Synthesizers
The Eaters
Keeping the Inside Strong
Sending and Receiving the Right Signals
Immunity and Defense...Invaders, who would like nothing more than to make us ill, bombard the human body daily. Most of those trespassers are harmless, but some are deadly. The immune system is the body's defense against such pathogens such as bacteria, viruses, germs, and allergens. The system is delicate, but extremely well directed, involving a variety of organs, tissues, and cells. Its ultimate goal is to protect and keep us healthy. On occasion, the system fails, resulting in illness. The immune response shifts objectives to destroying what has assaulted our body. It can receive assistance by resting, drinking plenty of fluids, and using medications when necessary. Several cells flow through our bodies as a primary line of defense. These include the white blood cells, or leucocytes. Their sole purpose it to find and destroy disease-causing agents. The phagocytes eat pathogens, and lymphocytes help the body to remember and recognize previous prowlers. Neutrophils fight bacteria, B cells search and label the targets, and T cells destroy what the B cell has labeled. The technical name for a foreign substance is an antigen. B cells produce antibodies that connect to the antigen. The antibodies remain in your system to protect against any subsequent invasions of that specific antibody. Several types of immunity also aid in the body’s protection. Infants receive innate immunity at birth from their mothers. Active immunity develops as people contact and experience specific illnesses or receive vaccines.
Life's Interactions
<<Back