MCQ
Passive immunity can be obtained by injecting
- AAntigens
- ✓Antibodies
- CAntibiotics
- DVaccination having weakened germs
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$R$ : All biotic and abiotic factors are managed by humans in these ecosystems.
$bb =$ for brown colour alleles
Offspring of a cross between a black mouse and brown mouse allowed to interbreed than find out the percentage of black coat in them