If 20N force produces an acceleration of 5ms^-2 In a body then the mass of the body will be: A.4kg
B.5kg
C.1/4kg
D.1/5kg

F = ma
m = F/a
m = 20N / 5m/s^2
m = 4kg

Answertechnician (a) is correct;

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.