This question is for a medical course i am taking online this summer and I really need help on it Blood returns to the heart from the systemic circulation through which blood vessels?

aorta, coronary sinus, pulmonary veins

inferior vena cava, superior vena cava, coronary sinus

pulmonary veins, inferior vena cava, superior vena cava

inferior vena cava, superior vena cava, aorta

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.

Waste is deposited into in thin layers which are then compacted and covered with soil.

Ahallmark of psychology is conducting research on any and all human and animal behavior, mental abilities and biological process. let’s say you are a psychologist who was granted funding to conduct a research study. what would you research and hope to find? what phenomenon or experiences have open your interests to this? what would you predict the outcome of your study would find?