D.. they’re all correct I believe.
The gastrointestinal wall is composed of four layers or tunics:
- Mucosa
- Submucosa
- Muscularis mucosa
- Serosa
The innermost tunic of the wall is known as the mucosa or mucous membrane layer. The digestive tract's lumen is lined with it. The mucosa comprises epithelium, a layer of lamina propria, a loose layer of connective tissue, and the muscularis mucosa, a thin layer of smooth muscle.
The mucosa is surrounded by a substantial layer of loose connective tissue known as the submucosa. Blood arteries, lymphatic vessels, and neurons are also present in this stratum. The adventitia is a connective tissue that makes up the digestive tract's outermost layer above the diaphragm. It is referred to as serosa below the diaphragm.
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A withdrawal of spending from the economy’s circular flow of income and expenditures is also known as..... leakage! :)
Answer:
C
Explanation:
Sand has the biggest particle sizes hence also the spaces between the particles. Clay has the smallest particles hence also inter particles spaces. However clay has more pores per volume compared to sand due to having very many small particles. However clay retains water the least because these pores are small and not interconnected (as compared to sand) and water takes more time to 'weave' through the small inter-particle spaces. The best soil to use in agriculture is loam soil because it has the right proportions of sand, clay, and silt that ensures it has a proper drainage and nutrient retention ideal for plants.
Facilitated diffusion occurs with the help of a transport protein, such as electrons passing through ATP synthase in the electron transport chain.
