What PHYSICAL characteristics occur during the digestive process?

When analyzing tree rings, what do scientists assume a thin ring indicates?

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

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water