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It prevents evaporation of water from the leaf to reduce the loss of water

Any 3 from. Skin. Mucus -in nose, trachea (cilia waft the mucus into the stomach to be destroyed) . Stomach acid. lysosomes (e.g. in tears and saliva)

20 miles

DNA is a double stranded helix. Each strand is held together by complementary base pairs or nucleotides. A nucleotide consists of a base, a deoxyribose sugar and a phosphate. The bases are A, T, C and G. ...

Transmission is the way in which a disease is spread. Transmission of disease can occur in multiple ways. Two methods of this are:1)- vector transmission 2)- waterAn example of vector transmission is tube...