The major causes of death that account for the large differences in life exxpectancy between less developed and more developed countries are b. infectious and parasitic diseases.
All matter is composed of very small particles called atoms.All atoms of a given element are identical.Atoms cannot be created, destroyed, or subdivided.In chemical reactions, atoms combine with or separate from other atoms.In chemical reactions, atoms combine with each other in simple, whole-number ratios to form combined atoms
DNA mutations create genetic variation.
They could have no visible effect, no affect at all or cause something to happen, e.g cancer, or genetic mutations in the gametes lead to genetic variation in offspring. They can also lead to genetic diseases, for example cystic fibrosis or Huntingtons disease
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Since blood group O are the universal donors, they can only receive blood from fellow blood group O humans due to the antibodies and antigens present in their blood.
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The chloroplast
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