Which of the following is an example of an ecosystem? A. an oyster
B. a school of fish
C. fish and sharks
D. the open ocean

D. the open ocean

Explanation:

The reason why I cannot be any of the other answers are because, A is just a single organism which would in fact be incorrect. A school of fish would be incorrect because, it only includes a bunch of the same fish. The Ecosystem (As it says in the capture below) is a bunch of different organisms that work together like a shark might eat the fish but, that is about it. The entire ocean is a great example of a ecosystem because, there are all kinds of things that create the ecosystem. Therefore, your answer could only be D. the open ocean.

Information in the picture below:

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.