The answer is Nuclear envelope.
Basically, the Nuclear envelope is an outer shell that protects the cell (which includes the dna) from any harmful things.
Animal cells do not have a cell wall or chloroplasts but plant cells do. This is just one example there are several ways. <span />
Answer:
Mars
Explanation:
The Deep Freeze: Ice on Mars. Like Earth, Mars has ice caps at its poles. Water reaches the poles as vapor and is frozen into thin layers that build up thick deposits. Mixed with this water is dust picked up by the wind, so the caps have bright and dark layers of "clean" and "dirty" ice.
Smooth muscle, also called involuntary muscle, muscle that shows no cross stripes under microscopic magnification. It consists of narrow spindle-shaped cells with a single, centrally located nucleus. Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically.
