1. Gravitational waves travel at the speed of light
2. Gravitational waves can be produced only when two black holes orbit each other and merge

1. Bt cotton, Bt Brinjal, and Bt mustard are GM crops approved for cultivation in India
2. Bt gene obtained from the soil bacterium Bacillus thuringiensis has been inserted into cotton DNA making the modified plant resistant to bollworm.

Which of the statements given above is/are correct?

1. Embryonic stem cells (ESCs) are isolated from blastocysts.
2. Adult stem cells upon differentiation, can generate all the cell types of the organ from which they originate.
3. Embryonic stem cells can also differentiate into more than 220 cell types present in the human body.