Seizures that involve both hemispheres at the outset are termed a. complex. b. generalized. c. partial. d. focal.

b. generalized

Explanation:

Generalized seizure is a type of seizure that is caused by an abnormal electrical activity throughout the brain, which begins with both hemispheres at the same time rather than starting at a discrete focal point.  

Grand mal seizure also called tonic-clonic seizure is a type of generalized seizure caused by epilepsy, stroke or other factors. A person affected by this usually becomes unaware of his environment when experiencing this type of seizure. The person losses consciousness, followed by muscle convulsions.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).