Recessive alleles seem to vanish in some generations and reappear in later generations because: a. They cannot be expressed in males

b. They are masked by a dominant allele

c. They cannot be expressed in females

d. They cannot be expressed in successive generations

e. They are lost by mutation

How do environmental factors influence genetic traits? a. environmental factors determine all genetic traits. b. environmental factors can determine if a genetic trait becomes a health issue. c. environmental factors are determined by genetic traits. d. environmental factors have no influence on genetic traits. select the best answer from the choices provided

Secondary pollutants are more harmful than primary pollutants. select the best answer from the choices provided ot of

Models are non-visual ways of coummincating how someone thinks about something in the natural world