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.
Irritation Threshold is defined as the name applies. It is the threshold or maximum point at which an individual has become irritated or annoyed.
A neurotransmitter
Hope this helps... mark as Brainliest plz
Like a prokaryotic <span>, a eukaryotic cell has a </span>plasma membrane<span>, </span>cytoplasm<span>, and ribosomes. However, unlike prokaryotic cells, eukaryotic cells have: a membrane-bound </span>nucleus<span>. numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria)</span>