One reason why caecilians are considered to be amphibians is because they go through metamorphosis to reach adulthood. Caecilians are unique amphibians because some of them lay eggs, but some of them give birth to live young.
Butterfly pupa anatomy
The pupa is the third stage of the butterfly's life cycle. The caterpillar creates a pupa, sometimes called a chrysalis, and emerges as the adult butterfly after metamorphosis. The butterfly's wings will be used for flying.
Buffalo grazing on Wyoming prairies
Grasslands are found where rainfall is low and temperatures are extreme. Grasslands experience drought and occasional fires. The soil of grasslands is deep, moist, and nutrient rich from dead grass and other organisms, which is good for agriculture.
Blood flow of moving Lumbriculus
Observe blood flow and muscle contractions in each body segment of Lumbriculus variegates (note how blood flows in relation to the worm turning in the capillary tube).
Bee on flower
Bees visit flowering plants to collect nectar so they can store it as honey back at their hives. As a bee visits one flower after another, pollen collects on its entire body and especially on the legs. Bees help pollinate flowers while they collect nectar. This is a mutualistic behavior.
Balance and flux
Ecosystems and populations of organisms within ecosystems function by the principle of balance and flux. Balance can be thought of as a state of equilibrium, or a state of equal changes between two sides. Flux can be thought of as a rate of flow or changes. Even small changes in an ecosystem's or population's balance and flux could lead to disaster.
Celery in pure water
The celery stalks take up the water and continue to live in this environment.
Female Artemia closeup
Close-up full body view of a female Artemia under one quarter-inch in size.
Global Longwave from CERES
CERES stands for Clouds and the Earths Radiant Energy System.
Numerical Simulation of Magnetic Flux Emerging Through a Model Solar Atmosphere: Density, Magnetic F
This animation is one of a series depicting the results of a two-dimensional ideal magneto-hydrodynamic simulation of magnetic flux emerging through a solar atmosphere. The simulation has a resolution of 300x500 cells and a length scale of 16 Mm x 6.8 Mm. The simulation depicts 1730 seconds in the evolution of the model.
Cumulative Earthquake Activity from 1980 through 1995 (WMS)
This animation shows a cumulative view of earthquake activity for the whole world from 1980 through 1995. Each dot on the image represents the number of earthquakes with magnitude greater than 4.2 that have occurred in a 0.35 by 0.35 degree area of the globe since January 1, 1980. A yellow dot represents 1 or 2 earthquakes, an orange dot represents about 10 earthquakes, and a red dot represents 50 to 200 earthquakes. The background image, if present, shows the topography of the ocean floor. As t
North America NDVI 1993 August
NDVI in North America for August 1993, based off data collected over the 1981-2000 time frame.
Arctic Ozone Hole from Earth Probe TOMS: February 1, 1997 through May 31, 1997
Ozone measurements from Earth Probe TOMS for February 1, 1997 through May 31, 1997 showing the formation of an Arctic ozone hole
Principles of Industrial Hygiene
Principles of Industrial Hygiene provides an introduction to the field of industrial hygiene and to occupational health in general. The instructor focuses on introducing concepts, terminology, and methodology in the practice of industrial hygiene and identifies resource materials. The class would benefit those wishing to pursue a Master's degree in industrial hygiene, those wishing to complete a certificate in occupational health, or for students in allied health fields needing a basic understan
Pharmaceuticals Management for Under-served Populations
Students will be guided to analyze problems and develop strategies based on real world drug management issues including regulations, manufacture, procurement, distribution, safety, policy, financing and the unique aspects of international pharmaceutical trade, the role of the World Trade Organization - Trade-Related Aspects of Intellectual Property Rights (WTO-TRIPS), government, non-governmental organizations (NGOs) and individuals/programs in the selection and use of pharmaceutical products. C
Global Tobacco Control
Provides an introduction to global tobacco control. Presents the health and economic burden of tobacco use worldwide and highlights practical approaches to tobacco prevention, control, surveillance, and evaluation. Examines transnational tobacco control issues, including the following: the interpretation and packaging of epidemiologic evidence for policy makers, the determinants of tobacco addiction, the economics of global tobacco control, tobacco industry strategies, legal foundations for regu
Examines health issues, scientific understanding of causes, and possible future approaches to control of the major environmental health problems in industrialized and developing countries. Topics include how the body reacts to environmental pollutants; physical, chemical, and biological agents of environmental contamination; vectors for dissemination (air, water, soil); solid and hazardous waste; susceptible populations; biomarkers and risk analysis; the scientific basis for policy decisions; an
Confronting the Burden of Injuries: A Global Perspective
Confronting the Burden of Injuries- A Global Perspective is a course offered by the Department of International Health and the Department of Health Policy and Management at the Bloomberg School of Public Health, Johns Hopkins University. This course is intended to guide students interested in working on injury control in areas with little to no tradition in injury prevention from a public health perspective. Students will learn to define the injury problem and assess its magnitude; identify data
Problem Solving for Immunization Programs
Countries around the world - even those at war - are collaborating to ensure that children under the age of five don't die from diseases for which vaccines are available. In the past twenty years, global vaccine coverage has surpassed eighty percent, and a second disease, polio, is nearly eradicated. In the United States, coverage rates are even higher, and vaccine-preventable diseases are now rare. Never have so many resources been focused on immunization - yet problems remain. Additional, high
Introduction to Economics
Introduction to Economics is designed to build an understanding of economic institutions, history, and principles. In addition, it will focus on relationship between private and public sectors of the U.S. economy. Also, it will analyze major economic institutions, such as property rights, markets, business organizations, labor unions, money and banking, trade, and taxation.