Food Chains and Food Webs - VTAide

Carnivores are sometimes characterized by the type of prey that they consume

Online Dictionary of Aquatic Science Terms, Freshwater …

Most living tissue is composed of a very high percentage of water, up to and even exceeding 90%. The of a very few cells can survive if their water content drops below 10%, and most are killed if it is less than 30-50%. Water is the medium by which mineral nutrients enter and are translocated in plants. It is also necessary for the maintenance of leaf turgidity and is required for photosynthetic chemical reactions. Plants and animals receive their water from the Earth's surface and soil. The original source of this water is precipitation from the atmosphere.

Photosynthesis, energy pyramids, phytoplankton and …

Living organisms can use energy in basically two forms: or . Radiant energy exists in the form of , such as light. Fixed energy is the found in organic substances. This energy can be released through . Organisms that can take energy from inorganic sources and fix it into energy rich organic molecules are called . If this energy comes from light then these organisms are called . In most ecosystems plants are the dominant photosynthetic autotroph.

Solar radiation is used in ecosystems to heat the atmosphere and to and water into the atmosphere. Sunlight is also necessary for . Photosynthesis provides the energy for plant growth and metabolism, and the organic food for other forms of life.