nararapat niyo pong sabihin kung anong katangian ng group1,dahil kung hidi, mahihirapan kami sumagot,
answer: the valid reasons are they may give a little failure effect of the vaccine that may cause us people to have sickness
explanation: some vaccines are dengue vaccine that also been failed to make,some children past away just of oneto two shots of it so this is one valid reason in my guess only
because trees covered the earth. its rooted from tge crust. it holds it surface. it covers and protects it.