Answer:
All of the above, option D.
Explanation:
The title of the research conducted by W.J Strawbridge and three other colleagues (namely; H.R Higby, S.J Shema and J.L Balfour) is ''Antecedents of Frailty Over Three Decades in an Older Cohort''. The research focus more on how old people within the ages of 65 and 102, and that old people tends to lose their abilities to do things they used to do while they were still young because of Frailty and also, because of the habits that people had before they turn to old adult such as smoking and heavy drinking, also, with all the three options (that is ''A'' to 'C') in the question are correct.
Different froms of a gene for a given trait is called Alleles
Explanation:
A different form of Gene comes in differing varieties. These are called Alleles.
For every Somatic cell, every gene contains two alleles (each allele being provided by respective parents).
It is impossible to determine which allele is present of a gene in an organism based only on physical observation. While some alleles can be recessive and dormant and silently passed to the offspring generation.
Some Common example of varying gene traits is the colour of plants where one colour is often dominant and the other recessive while in some other plant the recessive colour can be dominant.
Decreased interest in activities because it brings you down and unmotivated you
