Answer:
Option (e).
Explanation:
Nervous system is one of the most important systems of the organism that helps them to respond them towards the environment. The nervous system includes the brain, spinal cord and all the neurons.
Nervous system is present in highly complex organism and increases in complexity in case of higher animals. Lower animals do not have nervous system but still they respond to their environment with the help of chemical and receptor. Hence, all the animals have the ability to respond towards the environment.
Thus, the answer is option (e).
A. help keep joints flexible
Chlamydia is very common and can go unnoticed for months or even years. if left untreated it can cause infertility, pelvic inflammation,discharge.
Nicotine is a highly addictive substance that is found in tobacco. Chemicals in tobacco are inhaled into the respiratory system when you smoke. This can cause many problems such as lung and throat cancer. Thousands of deaths are recorded in the U.S. related to smoking tobacco.
