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digestion in man In the buccal cavity, saliva is secreted from the salivary glands into the mouth cavity. Saliva contains […]

genetic engineering Genetic Engineering is the manipulation of gene (DNA) to produce useful products It involves isolation, removal and cloning […]

xylem parenchyma cell collencyma cell straited muscle (i) Xylem Made up of vessels and tracheid Consist of dead cells Allows […]

the placenta uterus and pituitary gland (a)(i) Placenta Link between mother and foetus Supply food to foetus Supply oxygen to […]

speciation natural selection mutation Lamark’s theory of “Use and disuse” The creation of new species is known as speciation and […]

advance level biology 2014 paper 2 answer guide ADVANCED LEVEL BIOLOGY PAPER 2 MARKING GUIDE (2014) 1(a) tracheal system consists […]

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