Which arrow, or series of arrows, represents the movement of atmospheric oxygen (O2) during respiration?

What are charcteristics of lithosphere?

The response is the basis for vaccination. primary secondary tertiary none of the above

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates