Read the following statements carefully and choose the correct one 1 mark (a) BCG is a triple vaccine effective against tuberculosis .typhoid and malaria.

(b) Malaria is transmitted by both male and female Anopheles mosquito.
(c) Chronic diseases are characterized by drastic long term effects.

(d) Antibiotics inhibit the bacterial growth by blocking their biochemical pathways.

(A) Options (a) and (c) only

(B) Options (b) and (c) only

(C) Options (c) and (d) only

(D)Options (b) and (d) only.

b.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

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