Producers of many mouthwash brands claim that using mouthwash prevents tooth decay. what is the best conclusion regarding these mouthwash brands and bacteria in the mouth?
a. mouthwash contains ingredients that kill harmful bacteria.
b. mouthwash contains bacteria that produce oxygen.
c. mouthwash does not really work because the growth of harmful bacteria cannot be prevented.
d. mouthwash does not really work because bacteria is not known to directly cause tooth decay.

A. Mouthwash contains ingredients that kill harmful bacteria. Tell me if it's right

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.