Which substance facilitates chemical reactions? a. substrate b. enzyme c. lysosome d. product

Approximately hiw many new case of sti occur in the united states

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Calvin is a 12-year-old boy. due to pressure from his friends, he has started consuming certain toxic materials that are addictive and harmful. calvin is a victim of what type of abuse? a. sexual b. substance c. physical d. emotional