Answer: The FDA and USDA cerate food safety programs, safeguards to protect Americans, to protect people from unsafe food. The FDA has monitoring programs for pathogens, naturaltoxins, pesticides, etc.; their methods are science-based.
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The process that helps gas exchange occur is called diffusion.
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Answer: The percentage of the offspring that will be homozygous dominant is zero.
Explanation: Since tall pea plants are dominant to short pea plants, a cross between a heterozygous tall pea plant (Tt) and a homozygous short pea plant (tt) will produce four offsprings: two heterozygous tall pea plants (Tt) and two homozygous short pea plants (tt). Tt x tt = Tt, Tt, tt, and tt.
Tt is heterozygous dominant for tall height while tt is homozygous recessive for short height.
See the attached punnet square for more information.