Complete the second sentence so that it has a similar meaning to the first. Use which.
1. Because you can`t talk to babies, it makes it difficult to do research about their minds.
You can`t talk to babies, which makes it difficult to do research about their minds.
2. Some men and boys can be very aggressive, but this isn`t true of so many girls and women.
Some ________________ girls and women.
3. The research is controversial because it is about male and female brains.
The research is about _________________ makes it controversial.
4. The fact that girls often notice people`s problems means female brains may be built more for empathy.
Girls often _________________ built for empathy.
5. Maths requires a lot of systems-thinking and that`s why a lot of men choose it.
Maths ____________________ men choose it.
6. The author says that both genders have strengths and weaknesses and that makes a lot of sense.
The author _____________________ a lot of sense.

2. Some men and boys can be very aggressive wich isn`t true of so many girls and women. 3. The research is about male and female brains which makes it controversial.4.  Girls often notice people`s problems which means that their brain may be  built for empathy.5. Maths requires a lot of systems-thinking which is the reason why men choose it.6. The author says that both genders have strengths and weaknesses which makes a lot of sense.