The idea of "healthy aging" is one that has been extensively studied by scientists and researchers who investigate physiological reasons why some people experience less severe mental and physical declines as they age, as compared with others. A team of biologists led by Frances Evans, Daniela Alí-Ruiz, and Natalia Rego studied the protein CD300f, an immune receptor that has been linked to aging. The researchers tracked the aging of mice with and without CD300f over 30 months. The mice without CD300f showed reduced lifespan and increased frailty and were less likely to be able to complete cognitive puzzles than mice with CD300f, suggesting that -------Which choice most logically completes the text?the presence of CD300f contributes to healthy aging by impeding mental and physical decline.eliminatethe presence of CD300f is a risk factor for age-related health problems.eliminate"healthy" aging is not limited only to humanity, but can also be found in organisms like mice as well.eliminatethe presence of CD300f had no impact on the rate of mouse aging.