The following habitats can be found in West Africa except

Analyze the question: This is an "except" question. Three of the options are habitats found in West Africa, and one is not. We need to find the one that does NOT occur there.

Concept: West Africa lies in the tropics, so its habitats are shaped by tropical climate. Going from the coast northward, the vegetation zones are:

1. Coastal/mangrove swamp (saltwater, brackish areas such as the Niger Delta)
2. Rainforest (freshwater swamp and tropical rainforest)
3. Guinea savanna (derived and southern Guinea)
4. Sudan savanna
5. Sahel savanna (semi-arid, bordering the Sahara)
6. Desert (far north)

Temperate regions have four distinct seasons (spring, summer, autumn, winter) and moderate rainfall. Examples are the prairies of North America, the steppes of Eurasia, and the pampas of South America. West Africa has only two main seasons (wet and dry), so temperate habitats do not occur there.

Step-by-step check of the options:

• A. Mangrove swamp: Found along the Nigerian coast, such as the Niger Delta. It occurs in West Africa.
• B. Sahel savanna: Found in the northern parts, such as Borno and Yobe in Nigeria, and in Niger and Mali. It occurs in West Africa.
• C. Savanna grassland: Widespread across the middle belt, for example the Guinea and Sudan savanna. It occurs in West Africa.
• D. Temperate grassland: Found in temperate climates, not in the tropics. It does not occur in West Africa.

Answer: The habitat that cannot be found in West Africa is D. temperate grassland.

Tip: In "except" questions, look for the option that clashes with the region's climate. Words like "temperate", "tundra" and "taiga" never belong in a tropical West African context, so you can eliminate them quickly.