MCQ
Two main structural features of an ecosystem are.
- ✓Species composition and stratification.
- BSpecies composition and productivity.
- CProductivity and energy flow.
- DNutrient cycling and stratification.
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$R$ - $AIDS$ is caused by $HIV$.
$1.$Formation of the chromosome theory of heredity
$2.$Experiments which proved that $DNA$ is the hereditary material
$3.$Mendel's laws of inheritance-discovery
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