Question

1 how could a scientist determine if an organism is unicellular or multicellular?
2 how does the skeletal system help the nervous system?
3 what is the difference between voluntary and involuntary muscles?
list six body systems:

1. 4.

2 5.

1. 6.

skin cells need nutrients to survive. what two systems get nutrients to your skin cells?

Explanation:

Answer:

1. A scientist can use a microscope to observe whether the organism is composed of a single cell or multiple specialized cells.
2. The skeletal system protects the central nervous system, with the skull shielding the brain and the vertebral column protecting the spinal cord.
3. Voluntary muscles are under conscious control (e.g., skeletal muscles), while involuntary muscles function automatically without conscious thought (e.g., cardiac and smooth muscles).
4. 1. Circulatory, 2. Respiratory, 3. Digestive, 4. Nervous, 5. Skeletal, 6. Muscular
5. The digestive system and the circulatory system.