Question

Improve the bracketed part of the sentence.
Scientists (have developed) an "organ-on-a-chip" platform to study how drugs are transported across the human placental barrier.
A) have develop B) has developed C) is develop D) No improvement

Answer 1

Answer:

scientists has developed an organ on a chip platform to study how drugs are transports across the human placental barrier.

Answer 2

Explanation:

B) Has developed

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