it is the presence of minor and unwanted constituents in material, physical body, natural environment, workplace, etc. a. contamination b. microorganisms c. preventive d. organisms?​

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

The negative impacts of nonnative species generally outweigh the positive impacts