Manatee mortality rates have been studied extensively to determine the greatest threats to their populations and to develop protection plans. the table below shows fractions of mortality due to various causes based on data from salvaging manatee carcasses from 2001 to 2009. based on the table below, what would be the most effective regulations to introduce to protect manatees in this region? manatee mortality rates by cause cause adult mean % of mortality calf mean % of mortality watercraft 0.54 0.36 marine debris 0.03 0.02 regulations to enforce no wake zones for boats regulations to prevent excessive runoff regulations to penalize littering regulations to reduce carbon emi