Give a brief answer:
 
A student observes an animal cell under a microscope and notices a double-layered membrane enclosing a dense region with pores. Inside, there are thread-like structures and a round dense body.
 
Answer variants:
Nucleolus
ribosomes
Transfer materials between nucleus and cytoplasm
a. What is the function of the nuclear pores?
.
 
b. Which structure inside the nucleus is known as the “factory of ribosomes”?
.
 
c. The nucleolus synthesizes
.