Which of these structures is found in the stomach but nowhere else in the alimentary canal? a. a circular muscle layerb. mucus-forming cellsc. a lining of columnar epotheliumd. an onblique muscle layer

d. an onblique muscle layer

Explanation:

The alimentary canal has four main layers:

Mucosa (innermost layer which surrounds the lumen), submucosa (connective tissue with blood vessels, lymphatics, and nerves), muscular layer, serosa ( outermost layer of connective tissue).

Muscular layer is subdivided into:

•the inner- arranged in circular rings, prevents food from travelling backward  

•  outer layer- arranged longitudinally,  shortens the tract.

The stomach has an extra layer called inner oblique muscular layer (churning function).

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

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