Scientists investigated the success of transferring cloned embryos into surrogate ewes (female sheep).

In total, 1250 cloned embryos were transferred, resulting in 290 pregnancies. From these pregnancies, 54 newborn lambs were born.

Calculate the percentage of transferred embryos that successfully developed into newborn lambs. Show your working.

The formation of a placenta is essential for the successful development of a mammalian embryo into a fetus.

Name the specific organ in the female reproductive system where the placenta forms and attaches.

Suggest how the structure of the placenta is adapted to allow the exchange of substances between the mother and the fetus.

Newborn lambs feed on colostrum and milk from their mothers. Suggest how the components of milk help the lambs to survive and develop.