The first step in treating water from a river or lake is usually

a.
chlorination.
b.
coagulation.
c.
concentration.
d.
filtration.

Which symbols below represent the ions found in the glass of water ? a. oh- and h+ b. co2 and o2 c. o2 and h2 d. nh3- and h+

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures