Why is it important to wear a condom?

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

Why do mountaineers become breathless as they reach high altitudes

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