Biology learning in the 21st century leads to the empowerment of metacognitive skills. Increased metacognitive skills can support concept understanding and maximize the students' retention of concepts. This research aimed at investigating the effect of project-based learning strategy on metacognitive skills, concept understanding and retention of class X students of Senior High School 1 Kairatu, West Seram District, Maluku. This research is a quasi-experimental research using pre test-post test nonequivalent control group design. The samples of this research were all students of classX1 of Senior High School 1 Kairatu. The data obtained in this research were the learning results of metacognitive skills, concept understanding, and retention of the students. The data were analyzed by using analysis of covariance (ANCOVA). The research results showed that the implementation of project-based learning strategy had a significant effect on students' metacognitive skills, concept understanding, and retention. Furthermore, the results of post hoc LSD test showed some differences in the notation between the project-based learning strategy and the conventional learning strategy. These results indicated that the learning stages of projectbased learning strategy could empower the students' metacognitive skills, concept understanding, and retention.

The heavy metal pollution in marine environment is caused by industrial and mining waste (Gümgüm et al., 1994), geographical, industrial, agricultural, pharmaceutical, domestic, and atmospheric wastes (He et al., 2005;Tchounwou et al., 2012). According to Şireli et al. (2006) and WHO (2008), heavy metals such as lead, cadmium and cuprum are toxic, and are mostly found in marine environments. In addition, the heavy metals in marine environments cannot be degraded, and can accumulate in organisms through industrial, atmosphere, soil, water cycles and food chain processes (Ziyaadini et al., 2017;Rodríguez et al., 2015;Monsefrad et al., 2012;Naghshbandi et al., 2007).A lot of research has been conducted on the accumulation and distribution of heavy metals in marine environments and various biota, for example, the research on the heavy metal contamination in water and sediment conducted by (Bhuyan et al., 2017;Varol and Sen, 2012), and the research on heavy metal concentrations in Oysters (Crassostrea sp) in Setiu Wetlands, Terengganu (Shaari et al., 2016). Bioaccumulation of heavy metals in water

This research aims at investigating the effect of Complex Instruction integrated with Team Product (CITP) learning model on students' creative thinking skills, critical thinking skills, metacognitive skills, scientific attitudes, cognitive learning results, and retention. This research used quasi-experimental design with pretestposttest nonequivalent control group design. This research was carried out in several Senior High Schools in Ambon, namely SMA 1 Ambon, SMA 4 Ambon, SMA 5 Ambon, SMA 13 Ambon, and SMA Kristen Ambon in the even semester of the academic year 2017/2018. The results of the research were analyzed using ANCOVA. A post hoc LSD test was also performed if there were differences in each variable. The results of the research show that the CITP learning model affects creative thinking skills, critical thinking skills, metacognitive skills, scientific attitudes, cognitive learning results, and retention of class X senior high school students on Ecosystem learning material. The syntax of the CITP learning model can improve students' creative thinking skills, critical thinking skills, metacognitive skills, scientific attitudes, cognitive learning results, and retention compared to the learning model commonly implemented by the biology teachers.

This study aims to investigate the effect of Resource Based Learning Design Thinking (RBLDT) model to improve student's creative thinking skills, concept gaining, and digital literacy. It is a quasi-experimental study using pre-test and post-test nonequivalent control group design. Furthermore, it was conducted at several senior high schools in Ambon, such as Senior High School 1, 2, 12, and Senior High School Siwalima Ambon in the odd semester of the 2019/2020 academic year. From each school, three classes were selected, and 36 students were used as the study samples to obtain a total of 432 students. The data were analyzed using ANCOVA, and post hoc LSD test was performed for every significant result obtained. The results showed that the RBLDT learning model has an effect on creative thinking skills, concept gaining, and digital literacy of students in the class XI senior high school on the subject matter of animal tissue (p<0.05). The combination of the RBLDT learning model syntax can improve students' creative thinking skills, concept gaining, and digital literacy better than RBL or DT when implemented separately.   Keywords: Resource-based learning (RBL), design thinking (DT), RBLDT learning model, creative thinking, concept gaining, digital literacy

Hibiscus sheet mask is a natural skin care solution made from hibiscus flower (Hibiscus rosa-sinensis L.). The purpose of this study was to analyze the physical, chemical, and organoleptic of hibiscus sheet mask as an alternative to natural skin care. This study used a red and layered hibiscus flower crown. Extracts were made using the maceration method. The results of the flower extract are then made in various variations of mask formulas. The Hibiscus sheet mask was then analyzed by 10 panelists for its physical, chemical and organoleptic. The results showed that the higher the concentration of hibiscus flower extract, the more it produced a mask that was red in color, had a hibiscus aroma and a thick texture. The higher the concentration of hibiscus flower extract, the more the mask has a low pH. Meanwhile, the panelists prefer the hibiscus sheet mask with the 75% formula (F3). Thus, the hibiscus sheet mask can be accepted by the panelists.