A(n) or convulsion, is a series of violent and involuntary contractions of the muscles; it is usually related to brain malfunctions that can result from diseased or injured brain tissues.

Seizure

Explanation: Seizure is an uncontrolled or uncoordinated electrical activity in the brain. The central nervous system is made up of the brain and the spinal cord which are composed of neurons that conduct and transmit electrical/nerve impulses to the brain. In diseased or injured brain tissues, there is abnormal synchronization of these electrical signals by the neurons which results in seizures or convulsions.

explanation:

the sequence of amino acids in a protein determines its function. the dna sequence of a gene determines the amino acid sequence of the resulting protein. thus, any changes in dna sequence can result in changes in protein function. this is called a mutation.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.