Landmark
1. A mark to designate the boundary of land; any, mark or fixed object (as a marked tree, a stone, a ditch, or a heap of stones) by which the limits of a farm, a town, or other portion of territory may be known and preserved.
2. Any conspicuous object on land that serves as a guide; some prominent object, as a hill or steeple. Landmarks of history, important events by which eras or conditions are determined.
Origin: as. Landmearc. See land, and mark a sign.
This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..
Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..
Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..
The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..