Question

Tick the correct forms of the verbs.
1. It ___________________ scientifically ______ that low-level radiation damages tissues,

cells, DNA and other vital molecules.

(a) had been, established

(b) has been, established

(c) was, established

(d) will be, established​

Answer 1

Answer:

Has been and established

Explanation:

Hope it helped you

Answer 2

Has been and established