This study aims to learn about using the WhatsApp application in online learning during the COVID-19 pandemic. The method used is Traditional Review. The results showed that WhatsApp was useful in bridging the communication gap between lecturers and students during the e-learning process and cost-effective, easy and practical to use. In conclusion, the use of the WhatsApp application tends to get a positive response, so it has an important role in the world of education during the COVID-19 pandemic.  Keywords: COVID-19, Online Learning, WhatsApp

This study aims to determine the initial content of copper metal found in land kangkung (Ipomoea reptans) plants. The method used is the descriptive quantitative analysis method. The results showed that samples 1, 2, 3, and 4 each had <0.50 mg/kg copper metal found in land kangkung. In conclusion, land kangkung has not been polluted, so it is safe for consumption and can also be used as phytoremediation in an environment contaminated by heavy metals. Keywords: Detection, Kangkung Land (Ipomoea reptans), Copper Metal (Cu)