K Potassium Na Sodium most
Ca Calcium reactive
Mg Magnesium
Al Aluminium
Zn Zinc
Fe Iron
n Tin
Pb Lead
Cu Copper
Ag Silver
least
Au Gold
reactive
Pt Platinum
Which metal would most likely replace lead in a solution?
potassium
copper
silver
gold

Specialized cells which perform a particular function form : organisms organs tissues

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water