In which two islands did the portuguese have their sugar plantations?

 The correct answer is :  The islands of Madeira and

Cape Verde

Explanation:  Madeira is located on the northwest coast of Africa, in 1945 the Portuguese bring sugar cane to the island for production. The work was done by slaves. The Cape Verde Islands are located on the west coast of Africa, the Portuguese explored them in 1448.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.