White leafy seadragon
This seadragon is white with a light pattern. It has a snout (right end) and the back end is to the left. Seadragons can't hold onto sea plants like seahorses can. It has some fins along its back that it uses to propel itself and move around in the water. The leafy parts are only used to blend in and ...
Seahorses can use their tails to hang onto plants around them. Seahorses can also swim, but hang onto sea plants when they want to rest or when there is a strong ocean current.
Wild cucumber plant at Tucker Wildlife Center.
This plant is likely exposed to direct sunlight during most of the day. "Sun" leaves are generally thicker than the leaves of plants from shady areas.
Although this muskmelon plant has wilted from a bacterial infection, plants can wilt for other reasons and look just like this one. Plants can be over-watered and under-watered. Plants have a range of tolerance in which they can grow. Plants also have an optimum amount of water they can receive and ...
Young corn plants
These corn plants grew from small corn kernels. They have many green leaves so they can absorb sunlight and make food to grow. These plants will later produce ears of corn.
Young green plants in forest
These young plants grew from small seedlings after they sprouted from a seed. They have several green leaves to collect sunlight.
Yucca plant in the Mojave desert
Yucca plants use an alternative form of photosynthesis that allows them to conserve water. This is an adaptation to the dry desert environment.
Zebrafish embryo development
Early development of Danio eggs note the internal structure and the cluster of eggs (note the large yolk attached to the two-cell egg). The cells all divide at the same time. Within two days this mass of dividing cells will take on the shape of a zebrafish larvae.
Zebrafish fertilized egg
Developing 8-cell stage attached to a large yolk sac of Danio.
Hands-on Experiments To Test for Acid Mine Drainage
This is an on-line prototype for a book aimed at teaching kids the effects of acid mine drainage on our environment through experimentation and observation. Experiments introduce litmus paper, pH testing, neutralization, identification of aquatic organisms and their use as water quality indicators, acid mine drainage, organisms in acidic environments (including plants, bacteria, and algae), oxidation-reduction reactions, the manganese cycle, the water cycle, and treatments for acid mine drainage
Risk Assessment for Toxic Air Pollutants: A Citizen's Guide
This EPA fact sheet provides easy-to-understand information about air pollution and how it affects human health. Topics include health risks, exposure assessment, dose-response relationships, risk assessment, and risk characterization. Simple diagrams and pictures support the text.
National Middle School Science and Technology Bowl
Two competitions: an academic competition in which middle school students answer fast-paced questions about math and science (earth, physical, life, and general science) and a model fuel cell car competition that challenges students to design, build, and race model cars.
Although a great deal of emphasis of the course is on the structures of the organs and tissues, this is not a course based solely on pure microscopic descriptions. Lectures and laboratory sessions will focus on the integration of structures with functions, drawing from many disciplines (light/electron microscopy, cell biology, biochemistry, physiology etc.). Highlights of the course are its magnificently detailed collections of tissues as represented in the Circulatory Lecture.
Often referred to as the powerhouses of the cell, mitochondria provide the energy that powers nearly every cellular process. This essay by John Ross describes in detail the structures and functions of these amazing organelles.
Engineering for the Earth
Young students are introduced to the complex systems of the Earth through numerous lessons on the Earth's natural resources, processes, weather, climate and landforms. Key earth science topics include rocks, soils and minerals, water and natural resources, weather patterns and climatic regions, wind, erosion, landforms, and the harvesting of fossil fuels all presented from an engineering point-of-view. (See the Unit Overview section for a list of topics by lesson.) Through many hands-on activiti
The Growling Stomach
In this lesson, the students will investigate what types of plants and insects they could eat to survive in the Amazon. They will research various plants and/or insects and identify characteristics that make them edible or useful for the trip. The students will create posters and present their findings to the class.
Put a Spark In It! - Electricity
Uncountable times every day with the merest flick of a finger each one of us calls on electricity to do our bidding. What would your life be like without electricity? Students begin learning about electricity with an introduction to the most basic unit in ordinary matter, the atom. Once the components of an atom are addressed and understood, students move into the world of electricity. First, they explore static electricity, followed by basic current electricity concepts such as voltage, resista
In this unit, students look at the components of cells and their functions and discover the controversy behind stem cell research. The first lesson focuses on the difference between prokaryotic and eukaryotic cells. In the second lesson, students learn about the basics of cellular respiration. They ...
Mixtures and Solutions
This unit covers introductory concepts of mixtures and solutions. Students think about how mixtures and solutions, and atoms and molecules can influence new technologies developed by engineers. The first lesson explores the fundamentals of atoms and their structure. The building blocks of matter (protons, electrons, neutrons) are covered in detail. The next lesson examines the properties of elements and the periodic table one method of organization for the elements. The concepts of physical and
Rolling Blackouts & Environmental Impact: What are our Electricity Options?
The goal is for the students to understand the environmental design considerations required when generating electricity. The electric power that we use every day at home and work is generated by a variety of power plants. Power plants are engineered to utilize the conversion of one form of energy to another. The main components of a power plant are an input source of energy that is used to turn large turbines, and a method to convert the turbine rotation into electricity. The input sources of en