What federally illegal drug, when used during pregnancy, can restrict the oxygen that reaches the fetus and lead to infants who are irritable, nervous, and easily disturbed?

Marijuana

Marijuana is a psychoactive drug and it includes the dried leaves, seeds, stems and flowers, from the Cannabis sativa or Cannabis indica plant. Marijuana is a federal illegal drug and it contains tetrahydrocannabinol (THC); a compound that has intoxicating effects and other similar compounds. The use of marijuana during pregnancy can lead to damaging health consequences for both the mother and baby. Marijuana is associated with lower birth weight, and high risk of brain, and behavioral problems in babies.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

not sure if this is what you'r looking for eubacteria and archaebacteria