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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
give three ways in which a plant might be adapted to a hot dry environment a plant might be adapted to a hot dry environment by having a decreased
give three ways in which a polar bear is adapted to its environmenta polar bear is adapted to its environment by its high ratio of bulk to surface
what two biotic factors could affect an antelope living in the serengetithe biotic factors that may affect an antelope living in the serengeti could
what two abiotic factors might affect a an animal living at the bottom of the sea b a plant growing on a mountainside a the abiotic factors which
what is the distinction between interspecific competition and intraspecific competitioninterspecific competition takes place among organisms of the
what resources are competed for by a animals b plants a animals compete for food mates and shelter b plants compete for light water and
name three sources of energy which do not depend on fossil fuelsources of energy which do not rely on fossil fuel are water hydroelectric generation
in what ways can modern agriculture threaten the survival of speciesmodern agriculture destroys the natural vegetation eg woodland hedgerows on a
in what ways can we try to protect a species from extinction we can attempt to protect species from extinction by making it illegal to kill the
how could humans be disadvantaged by the extinction of a plant speciesthe loss of a plant species may deprive humans of any beneficial substances eg
in what ways could human activity lead to the extinction of a species in an areahuman activity could lead to extinction of a species by a
state two ways in which sulphur dioxide emissions from coal-fired generating stations could be reduced sulphur dioxide emissions can be reduced by
awhat do you understand by the term monoculture b what is one disadvantage of a monoculture a monoculture is the term applied to the growing of
in what way do chlorofluorocarbons cfcs cause global problemschlorofluorocarbons react with and deplete the ozone in the ozone layer this permits
explain briefly why greenhouse gases lead to global warmingthe greenhouse gases do not interfere with the short-wave radiation reaching the earth