Antibodies are 1 point
proteins that recognize familiar antigens
proteins that recognize foreign antigens
sugars that recognize familiar antigens
sugars that recognize foreign antigens

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.