Stable ecosystems can be altered, either rapidly or slowly, through human activities, natural disasters, climatic changes. An ecosystem may be described as a community and its surrounding which includes non living organisms. Human activities such as deforestation, mining, dumping of wastes on the oceans alters and affects the ecosystem negatively and thus making the habitats unfavorable for the organisms. Natural disasters such as floods, tsunami and climatic changes may also alter the ecosystem.
The metric unit for the lenght is "meters"
Answer:
I don't want to be that type of person but... This question can't be properly answered without any given choices. Be sure to re-ask your question & someone may answer it!
Explanation:
Answer -interact with the antigen-class ii mhc complex presented by macrophages.
