Brain scans show that older people experience less tissue loss in the cerebral cortex.

Physically unfit

Explanation:

Brain scans shows that Physically Fit older People experience less tissue loss in the cerebral cortex.As aging causes certain portion of brain to shrink linked with complex learning. Physically Unfit older people may find difficulty in recalling names,solving complex problem and decreased focus ability while in physically fit older  people has good amount of blood flow in brain as compared to physically unfit people.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.