Which traits in the investigation showed incomplete dominance?

A child born with semi-curly/wavy hair

Explanation:

A child born with semi-curly/wavy hair is individuals exhibiting incomplete dominance because the crossing of parents alleles both straight and curly hairs to produce such offspring. Thus, incomplete dominance occurs to produce an intermediate trait between the two parent traits.

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then that particular organisms become extinct.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex