Question

charles brewer - carias has led nearly 200 expeditions in venezuela. he has discovered giant sinkholes and rappelled into unknown caves. he has also collected new species of plants and scorpions. brewer - carias has spent much of his life learning to spot subtle differences among them. \the idea of discovery is to see things that no one has seen before,\ he says. brewer - carias has found 22 new species in venezuela, including reptiles and insects. do it! brewer - carias is ____. a uncertain b cautious c artistic d observant

Explanation:

The text mentions that Brewer - Carias has spent much of his life learning to spot subtle differences among species and his idea of discovery is seeing things no one has seen before. This indicates he is observant. There is no evidence in the text to suggest he is uncertain, cautious, or artistic.

Answer:

D. observant