The role of active cytotoxic T cells is to attack . a. body cells that have been infected b. extracellular viruses and bacteria circulating c. antibodies circulating proteins d. complement proteins

Need will mark ! which features are created by groundwater erosion and deposition? check all that apply. a. stalagmitesb. sinkholesc. rillsd. stalactites e. gullies f. rivers

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time