Match the term of "hierarchy" of life with examples of each below: - DNA
- heart of a human or leaf of a plant
- skeletal muscle, smooth muscle or cardiac muscle
- bacterium
- nucleus or chloroplast
- hydrogen (one proton and one electron)

1. atom
2. molecule
3. organelle
4. cell
5. organ
6. tissue

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow