A questão refere-se ao texto abaixo:

In an early article, McKay suggested that the occurrence of PAHs (polyaromatic hydrocarbons) and textural and mineralogical features in the Martian meteorite ALH84001 were consistent with the presence of past life on Mars. A series of technical comments and responses address whether abiotic processes could have instead produced these features.

SCIENCE - December 20,1996.

Assinale a conjunção que poderia ligar as idéias contidas nos dois períodos do texto acima: