Qualification > Sciences
Biology Paper 1 and 3 help HERE ONLY!!!
camel:
MARK SCHEME FOR JUNE 2005 PLEASSSSSSEEEEE
sweetsh:
I PUT IT ON THE PREVIOUS PAGE LAST POST!
nid404:
--- Quote from: sweetsh on June 04, 2009, 07:57:34 pm ---Continous is the variation which changes during time, like youe height, weight......
Discountinous varitation is the one which doesnt change during time, like the gender,blood group...
--- End quote ---
this is correct sweety but we r supposed to know it like this;this is the base for y it changes with time and y it doesn't
Continuous variation are features/characteristics which are affected by both the environment and the genes like height and weight
Discontinuous variation are features/characteristics which are affected only by the genes and not by the environment like blood group,ability to roll your tongue,lobed ears
aquarian93:
wt do i need to noe abt drugs? alcohol and heroin are depressants rite?
hw abt nicotine? im confused :(
and wt are pesticides and herbicides? wts da diff b/w pesticides and insecticides?
pls help! thank you!
nid404:
know abt the harmful effects of all these
herbicides r used to kill weeds that compete with important plants(crops) for nutrients and sunlight
insecticides r pesticides that kill insects specifically (the name says it) cuz pests r not only insects there r plant pathogens,molluscs,birds and many more
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