The tropical rainforest is a biome with a constant temperature and a high rainfall. The level of humidity and density of the vegetation give the ecosystem a unique water and nutrient cycle. Rainforests around the world are threatened by human expansion.

Taiga (/ˈtaɪɡə/; Russian: тайга́, IPA: [tɐjˈɡa]; from Turkic), also known as boreal forest or snow forest, is a biome characterized by coniferous forests consisting mostly of pines, spruces and larches. The taiga is the world's largest biome apart from the oceans.

-plants

Grasslands have many names—prairies in North America, Asian steppes, savannahs and veldts in Africa, Australian rangelands, and pampas, llanos and cerrados in South America. ... Grassland ecosystems are particularly fragile because water is scarce.

-plants
oyon
, chamise
,poison oak
, scrub oak
, Yucca
cacti.
  myrtle,
hawthorn


It is shaped by a Mediterranean climate (mild, wet winters and hot dry summers) and wildfire, featuring summer-drought-tolerant plants with hard sclerophyllous evergreen leaves, as contrasted with the associated soft-leaved, drought-deciduous, scrub community of coastal sage scrub, found below the chaparral biome.

Tundra ecosystems are treeless regions found in the Arctic and on the tops of mountains, where the climate is cold and windy and rainfall is scant.

-plants
Water lilien
, algae,
duckweed
cattails
reeds

-climate
river
lake


Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes and ponds, rivers, streams, springs, and wetlands. They can be contrasted with marine ecosystems, which have a larger salt content.

Sea Grasses

Phytoplankton

Coral Reefs

Seaweed

Marsh Grasses

Sea Anemones

Sea Cabbage

and many others that haven't been discovered yet..

climate
flat
grass
trees
amall hills
bright flowers
weeds
wide lands
open lands

Marine ecosystems are among the largest of Earth's aquatic ecosystems. Examples include salt marshes, intertidal zones, estuaries, lagoons, mangroves, coral reefs, the deep sea, and the sea floor. They can be contrasted with freshwater ecosystems, which have a lower salt content.