A Global Assessment of the Water Footprint of Farm Animal Products
Hoekstra, A.Y. (2012) The hidden water resource use behind meat and dairy, Animal Frontiers, 2(2): 3-8.
Sponges are the basalmost of of the Porifera (; meaning "pore bearer"). They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like sandwiched between two thin layers of . Sponges have unspecialized cells that can and that often migrate between the main cell layers and the mesohyl in the process. Sponges do not have , or . Instead, most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes.
, the areas that are close to the shore, are constantly being exposed and covered by the ocean's . A huge array of life can be found within this zone. Shore habitats span from the upper intertidal zones to the area where land vegetation takes prominence. It can be underwater anywhere from daily to very infrequently. Many species here are scavengers, living off of sea life that is washed up on the shore. Many land animals also make much use of the shore and intertidal habitats. A subgroup of organisms in this habitat bores and grinds exposed rock through the process of .
Secrets of the Water Bear, the Only Animal That Can Survive in Space
The green, blue and grey water footprint of farm animals and animal
About two-thirds of the Earth is covered with water. This is home for many of the Earth's creatures. Many different kinds of animals live in water. Most people are familiar with living in water. Other animals that live in water include: , , , , and even some and .A sea cucumber floats in the waters of Bikini Atoll, once home to a series of infamous nuclear bomb tests. These echinoderms can grow to 6.5 feet (two meters) by feeding on tiny aquatic animals, algae, and even waste material. Sea cucumbers recycle food particles into fodder for bacteria much like worms do in soil. Though they are fairly simple animals, sea cucumbers do have one incredible defense mechanism—the ability to eject internal organs out of their anus and regenerate them later.Amazing Underwater Marine Life Enjoy this relaxing underwater video from the philippines. Most of the time the ocean appears to be blue because this is the color our eyes see. But the ocean can be many other colors depending upon particles in the water, the depth of the water, and the amount of skylight. The colors we see depend upon the reflection of the visible wavelengths of light to our eyes. Wavelengths of light pass through matter differently depending on the material's composition. Blue wavelengths are transmitted to greater depths of the ocean, while red wavelengths are absorbed quickly. Water molecules scatter blue wavelengths by absorbing the light waves, and then rapidly reemitting the light waves in different directions. That is why there are mostly blue wavelengths that are reflected back to our eyes. Sometimes oceans look green. This may be because there is an abundance of plant life or sediment from rivers that flow into the ocean. The blue light is absorbed more and the yellow pigments from plants mix with the blue light waves to produce the color green. Sometimes parts of the oceans will look milky brown after a storm passes. This is because winds and currents associated with the storm churn up sand and sediment from the rivers that lead into the oceans. The ocean may also reflect the blue sky. However this is prominent only at relatively low angles and when the water is smooth. Apart from the blue ocean color the most interesting thing in the ocean are the marine animals living in this habitat. Also their color is without light that bright as we see it in underwater photographs or underwater DVD Videos. This film was filmed with dive lights mounted on a underwater video camera and shows spectacular colors of the ocean inhabitants the graceful marine creatures.1) Density: Density is a measure of an object's mass in comparison to its volume. Water has a much higher density than air which means that animals must push back against the water in order to propel themselves. This is why water animals often have paddle-like fins that are efficient at pushing against the dense water. This is also why a streamlined shape is beneficial as it can cut through the water like a torpedo.