Loss of biodiversity could be because of…. There are multiple right answers, please mark them all for full credit.

An acidic solution has an increased concentration of [answer1] while a basic solution has an increased concentration of [answer2].  

Converting a prairie to a farm field is an example of________.

Exotic species can  become invasive in their new habitat, because of absence of their predators.  They can threaten the native species by competing for their resources, being predators, or bringing disease.

The melting point of a mixture will be [answer1] than either of the substances alone, therefore, it can be concluded that as melting point range [answer2] the purity of the sample [answer3]. 

Primary consumers are

When synthesizing aspirin, 3.012 g of salicylic acid (138.121 g/mol) were used. 2.538 g of aspirin (180.158 g/mol) were recovered. Answer must be to correct significant figures and proper units.   Calculate the theoretical yield of aspirin. [answer1] Calculate the percent yield. [answer2] Calculate the percent error. [answer3]

The majority of the water found on Earth is:  

The formation of bubbles when HCl is added to a magnesium ribbon is a type of chemical change. 

Extinction is the complete loss of a specie