500 years ago, how many children died before the age of 5 due to disease?

What type of lipids are found in all biological membranes?

What did hunter gathers do to alter the environment?

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