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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)

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. ...

Although they both promote sustainability:
Conservation is the human involvement in attempts to protect wildlife. Usually with endangered species where they can be tracked and looked...

20 miles

Calvin carried out ‘feeding experiments’ where radioactive labelled carbon was fed to plants. ¹⁴CO₂ is taken up the cells and is then fixed into photosynthesis. ¹⁴CO_2...