The circulatory system and respiratory system are protected by your skin, muscles, and ribs.
Answer:
A. Each half of the chromosome is genetically identical.
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.
Natural selection is the right answer hope this helps.
Answer:
nucleus is the answer your welcome
