Animals are an integral part of the Earth's ecosystem. Each organism in the ecosystem plays a role in supporting the ecological community, which means that animals play a vital role as well. Each organism in the ecosyste... More »

Animals need food to provide energy to existing cells and to provide the raw materials and energy for the construction of new cells. Cells in animal bodies combine oxygen with food to release energy. Even if an animal ha... More »

Animals need water in order for their bodies and brains to function properly because without water they will become dehydrated, malnourished and will ultimately not survive. Most animals actually gain the majority of the... More »

The different ways that animals and plants are interdependent in an ecosystem because they depend on each other for basic survival needs like food, protection, shelter and propagation. Plants provide food for animals and... More »

Arkive describes the African savannah as a vast grassland ecosystem with consistently warm temperatures, making it an ideal habitat for a wide variety of animals. African food chains vary slightly depending on location, ... More »

Animals live in the rainforest because it is the oldest ecosystem on Earth. Many of the world's rainforests have been around longer than 100 million years. More »

As of 2011, there were an estimated 7.77 million species of animals on Earth, encompassing all phylums and families in the animal kingdom. This number increases to 8.74 million if non-animal species from the plant, fungi... More » Science Biology Zoology