The most damaging event is B) introduction of a non-native animal species.
There are multiple cases in recorded history where invasive species have ruined ecosystems and even driven some species to extinction. An example of this is the dodo bird which went extinct due partially due to the invasion of rats into their habitats.
Acidity strength is determined by the ability of compound to donate H⁺
The easier it lose H⁺ the stronger will be the acid
also the more stable conjugate base formed the stronger will be the acid
So the arrangement will be:
Methane < Alcohol < Phenol < Carboxylic acid
because carboxylic anion (COO-) is more stable than phenoxide (Ph-O⁻) than alkoxide RO⁻ than CH₃⁻
Matter is classified as substances and mixtures.
Substances include elements and compounds. Element is something that cannot be broken down into anything more simple even by chemical methods. There are over 100 elements on earth and the most common ones include oxygen or aluminum or silicon.
Compound is something where 2 or more elements are chemically combined together, such as by electrolysis or heating. It cannot be broken down by simple physical methods, such as evaporation or filtration. Common Examples include carbon dioxide, sodium chloride etc.
Mixture is where elements or compounds are mixed together, and can be separated by simple physical methods. Examples include air or sea water. The proportion of the elements and compounds are not fixed.
