What area in the nucleus is responsible for assembling ribosomal subunits in eukaryotic cells?

nucleolus

The nucleus is the command center of our cells which contains our chromosomes and hereditary information needed for life’s growth and reproduction.  It has five main parts:

1) the nuclear membrane 2) nucleoplasm 3) Chromatin network 4) Nucleolus, and 5) the endosomes. The area in the nucleus where new ribosomes are assembled in the nucleolus – the dark spot stain like region inside the nucleus. 

thats not even an aswer choice

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers