What is the MAIN reason the author includes the section "Pathway Of Blood Through The Heart"? A
to emphasize to readers the crucial role oxygen plays in supporting the pumping function of the heart
B
to give readers a better idea of the complexity involved in keeping the human body alive
C
to illustrate for readers the overall reason the heart is divided into four separate chambers and functions as two pumps instead of one
D
to give readers a fuller understanding of how all the parts of the heart work simultaneously to function as a whole

Anwhen planning a water activity, it's best to include a friend or a group of friends rather than going alone, even if it's aneasy activity.tf

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.

The effects of tobacco use on society include high taxes and loss of life. select the best answer from the choices provided. t f