Which term can be described as "many different species living together, interacting with each other and with their physical environment?
A. a food chain
B. a food web
С. a nutrient cycle
D. an ecosystem

D

Explanation: community forms an ecosystem by its interaction with the abiotic environment. Species: A group of organisms that can potentially interbreed to produce fertile, viable offspring.

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

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