2. Why do researchers need a lot of data to monitor a species population? What trends can you see in the data that you would have missed otherwise?

Science

What is the percent by mass of oxygen in fe2o3

Find the number of moles of argon in 364g of argon.

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?