Match each term with its definition. Match Term - Headwaters
- Lentic ecosystems
- Ecotone
- Eutrophication

A) Excessive richness of nutrients in a body of water Lentic ecosystem

B) The border between two biomes Ecotone

C) Formed by a body of standing or still water Eutrophication

D) The beginning and source of the river

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

satellites are frequently used to make observations of the orbit on earth