<span> the cells begin to die after approximately 4-6 minutes of no blood-flow After around 10 minutes cells </span>will<span> cease functioning, and be effectively </span><span>dead hope this help </span>
It is letter B. Symbiosis
Symbiosis, a Greek word means living together. It is a specified class of a close and a long period of time natural interface between two different biological creatures – commensalistic, mutualistic, or parasitic.
Symbiosis can be necessary, which means that one or both symbionts completely depend on each other for existence and endurance, or either way they can generally live independently.
True! optic nerves do cross the midline in the optic channel to ensure that visual signals go to each hemisphere of the brain
