Which of the following is an example of moving properly for calf raises?

a : raising the heels, leaning slightly forward with knees and hips flexed

b : lowering the heels, leaning slightly forward with feet approximately shoulder width apart

c : raising and lowering the heels, leaning slightly backward with feet approximately shoulder width apart

d : raising and lowering the heels, leaning slightly forward with feet approximately shoulder width apart

Cardiovascular efficiency, muscular strength and endurance, flexibility, and body composition are all related factors.

In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu." although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. what is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? a) the virus was descended from a common ancestor of bird, pig, and human flu viruses. b) the infected individuals happened to be infected with all three virus types. c) related viruses can undergo genetic recombination if the rna genomes mix and match during viral assembly. d) the human was likely infected with various bacterial strains that contained all three rna viruses.

per vehicle mile, motorcyclists are times more likely to die in a crash than passenger car occupants.