ocean
The great body of salt water that covers mores than two thirds of the surface of the earth, any of its five principal geographical divisions, the atlantic, Pacific, indian, arctic, and Antartic.
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, sea land, and water in a cycle. This tutorial explains in brief what occurs in the water cycle. Also, it delineates what is groundwater and surface run-off. This is an essential background as to how the water moves in an ecosystem both geologically and biologically...
Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understand how animals adapt to their habitat. For instance, how animals thrive in aquatic habitat and are able to overcome osmosis. It also sheds light on the reasons animals adapt...
Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like organisms. Because of the expanding diversity of animal life forms, taxonomists eventually came up with a classification scheme to group them into various phyla. Know more about the early animals that were likely the first ones to roam the ancient seas through this tutorial...
The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms, such as mammals, could fit into. Eventually, every continent of the planet had its own variety of mammalian organisms and their own unique evolutionary chain and direction. Learn more about the early mammals that roamed the Earth alongside other organisms, such as reptiles, fish, and birds...
Explore why New Zealand has such unique flora and fauna, and learn why long periods of geographical isolation. This lesson introduces the country's endemic species, ecology, and geology. Learn why long periods of geographical isolation have led to a large number of endemic species - native species that are not found anywhere else...
New Zealand is known for its unique biodiversity, caused by its remarkable geography and geologic history. Breaking away from the supercontinent Gondwana about 80 million years ago, it has developed a distinct flora and fauna as a result of long geological isolation. Thus, many fascinating plants and animals are found nowhere else but in New..