Answer:
there are many..
Explanation:
wheel and axel are two type of forces in simple macine
Answer:
The study of internal structures is called anatomy forexample to study the internal structure of heart
Explanation:
Answer:
Nucleus
the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Nucleolus
a small dense spherical structure in the nucleus of a cell during interphase.
Answer:
Ribosomes
Explanation:
Rough endoplasmic reticulum, choloroplast and nucleus all are important organelles and are membrane bound except for ribosome