Toxic waste spills are a direct source of water pollution.
a. true
b. false

There are two types of sources of water pollution; the direct sources and indirect sources. Direct sources include effluent streams from factories, refineries, was treatment plants and others. Whereas for indirect sources, includes contaminants that enter the water supply from soil or groundwater systems and from the atmosphere via rain. Most of these sources derive from human activities. Toxic waste spills are by-products from the industrial plants or factories. It is a direct source of water pollution. The answer is true.

Ithink the dna sequences may vary but the amino acid sequences are identical.