The present work was performed to evaluate the levels of phytochemical constituents and the antioxidant and antibacterial properties of marine red seaweed (Kappaphycus alvarezii) and seagrass (Cymodocea serrulata). Quantitative phytochemical analysis. antioxidant activity and antimicrobial activity against five potential pathogenic bacteria was investigated. In each case. https://www.hacklinkci.com/