Closure of the valve (mitral valve and tricuspid valve)
Answer:
A) Viruses are also pathogenic
Explanation:
A pathogen<u> is an organism that is capable of causing a disease to another organism.</u> Viruses, similarly to bacteria, are able to cause a diversity of diseases. However, they are considered non-living organisms because they fully depend on another cell to survive and reproduce. Therefore, they can only cause an infection if the organism's cells can support the replication of the virus. Moreover, to cause disease, the infecting virus has to overcome numerous "challenges", from physical barriers to host defenses.
Viruses can cause the following diseases:
- Common cold
- Influenza
- Herpes
- HIV
- Ebola
- Smallpox
- Rabies
amongst many others...
Rocks breaking up due to acid rain
Chiropractors use hands-on spinal manipulation and other alternative treatments, the theory being that proper alignment of the body's musculoskeletal structure, particularly the spine, will enable the body to heal itself without surgery or medication.
Answer:
1 and 2 human 3 and 4 monkeys