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q which chemical elements are involved to form most of living biological matterthe chemical elements that form most of the molecules of living beings
a anti-malarial drugs kill the parasites in the blood but they do not cure the diseasewhy is this b why was the use of ddt insecticide not successful
by what means can malarial parasites be transmitted from an infected person to a healthy person the malaria parasite is transferred when a healthy
how can a baby become infected with a gonorrhoea b syphilis a during birth a baby might be become infected with gonorrhoea bacteria as it
a person with a cough takes a patent cough syrup in three days the cough is better does this mean that the syrup has cured the cough justify your
what sources of water are a most likely b least likely to contain pathogenic bacteria a water most likely to have pathogenic bacteria will be that
three ways in which food might become contaminated by harmful bacteriafood may become contaminated-i from the unwashed hands of a food-handlerii by
a give two examples of diseases which can be spread by contaminated drinking water b how can the spread of such diseases be prevented a typhoid
q a in droplet infection i where do the droplets come from ii what infective agents might they contain b give two examples of diseases normally
a what is the distinction among breathing and respiration b what part do ventilation and gaseous exchange play in these processes a breathing
which two gases are exchanged when living organisms breatheoxygen and carbon dioxide are the gases exchanged when living organisms
in what ways might a clothing b housing c writing have contributed to the survival of human beings a clothing and b housing provide warmth and
state two characteristics of humans which distinguish them from other primates two features which differentiate humans from other primates are their
which types of mammal are included in the primate group the primate group containsa lemursb monkeysc apes and
state the ways in which a all plant cells b some plant cells vary from animal cells a all plant cells have a cellulose cell wall b some
which invertebrate groups possess one three four or all of the features below segmented bodies hard exoskeleton jointed legs compound eyes three
which of the vertebrate classes a are warm-blooded b reproduce by laying eggs a birds and mammals are warm-bloodedb fish amphibia reptiles and
list the five kingdoms into which most living organisms can be classifiedmost living organisms can be classified asa bacteriab protozoac fungid
name three diseases caused by virusesthere are many diseases caused by virusvirus diseases include colds influenza herpes mumps measles chicken pox
give three examples of diseases caused by bacteriadiseases caused by bacteria contain tonsillitis blood poisoning scarlet fever tuberculosis typhoid
give one example in each case of the usefulness of bacteria in a a natural environment b an industrial process a in a natural environment bacteria
state three conditions in a society which could contribute to a reduction in the birth ratebirth rate might be decreased byi later marriages as
state the changes in society which could contribute to a falling death ratethe changes in society which could contribute to a falling death rate
what is meant by the expression infant mortality infant mortality refers to the number of babies in a population who die at the age of 1 year or less
what are likely to be the limiting factors in a population of a green plants b birds a in green plants the limiting factors are likely to be light