Your body systems work together to maintain internal conditions, or

Maintaining homeostasis keeps the internal environment in the body functioning properly. Many organ systems work together and maintain energy homeostasis. ... The skeletal system, the endocrine system, and the lymphatic system alsowork with the digestive system and process those nutrients.

C) to ensure each new cell has an exact copy of the dna

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes