D both alleles is the answer
Many factors affect water quality
Sedimentation.
Runoff.
Erosion.
Dissolved oxygen.
pH.
Temperature.
Decayed organic materials.
Pesticides.
They are called microscopic anatomy as the cell, tissues and organs are internal and needs a microscope for it to be seen inside the body.
The most abundant source of methane in the globe is coal-fired power plants.
