Question

21. An estuary is a transitional zone representing
(1) a vast area of saline water
12) a large number of organisms
(3) great productivity built on a large base
(4) unique ecological features and biotic communities​

Answer 1

Answer:

a large number of organisms

Answer 2

The estuary is a transitional zone representing 4) unique ecological features and biotic communities.

• An estuary is a place where freshwater joins with marine water and forms brackish water.
• Estuary word is derived from. the Latin word aestus means tide because the estuary is a zone where the tide meets with water flow.
• Estuary has a unique assemblage of animals and plants that have unique ecological characteristics.
• Plants that are especially found in the estuary are Douglas, pickleweed, gumweed, red algae, salt grass and sea lettuce.
• Estuaries also contain animals such as worms, snails, shellfish, crabs fish and mangroves.