I looked it up and got energy not sure though
Answer: muscle contraction of sustained force resulting from repeated action potentials. (Option A)
Explanation: Tetanus is also called physiologic tetanus. Tetanus refers to the contraction of the muscle, which is established when the motor nerve that supply nerves to a skeletal muscle produces action potentials at a very high degree.
However, tetanic contraction is usually a normal process (such as when carrying a heavy box). Also, muscles can be shorten, lengthen or remain constant length during tetanic contractions.
An invertebrate, because an animal with a vertebrate is an animal with a backbone.
Answer:
No harm upon ecosystems or the environment, prevention of any harmful contributions to air, water and land pollution.
Answer:
To know about something briefly is called knowledge