Which aquatic ecosystem is home to more than one-third of north american bird species? a. rivers and streams b. wetland c. estuary d. ponds and lakes

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i