Contextual teaching and learning is quite important to be applied due to students weakness in connecting between what they learn and how the knowledge will be used. It is a learning system that matches the performance of the brain, to construct patterns that embody meaning, by linking the academic content with the context of learners’ everyday life. By applying contextual teaching and learning the information received is not only stored in short-term memory, which is easily forgotten, but can be stored in long-term memory. Contextual teaching and learning can be applied through various learning components. One of them is by applying appropriate learning resources/learning media to facilitate contextual learning. Through research and development applying Plomp model, a handbook has been developed to identify specific invertebrates exist on the coast of Bintan (the Province of Kepulauan Riau). This handbook was developed through processes namely; (1) collecting invertebrates of the coastal area of Bintan, (2) identifying invertebrates using research publications, (3) displaying content in the form of handbooks applying attractive designs, (4) suggestions for improvements by validators, and (5) test the feasibility through trials in learning. These processes drive the handbook different from most learning resources on this topic that do not specifically provide information about invertebrates exist in Bintan or Kepulauan Riau. The using of handbook encourages 100% completeness in learning mastering for 21 students. Furthermore, it increases learning motivation in a high increasing category.

Background: Coronavirus Disease 2019 (Covid-19) is an infectious disease caused by the new Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) virus which was first detected in Wuhan City of China and spread widely to more than 180 countries in the world . Given the high number of Covid-19 cases both globally and nationally, this study aims to identify the characteristics of co-morbidities in patients with Covid-19. Method: This research is a qualitative descriptive research using secondary data through the official website covid.go.id. Results: a descriptive study through the official government website showed that the majority of Covid-19 sufferers were dominated by women (51.3%) with most of the deaths occurring in the age group > 60 years (46.7%) and the majority of Covid-19 patients suffered hypertension (50%) and diabetes mellitus (37.2%). Conclusions and Suggestions: Most of the co-morbidities in patients with Covid-19 in Indonesia occur in the age group >60 years with chronic disease conditions, the majority being hypertension and diabetes mellitus. So, as a self-defense effort, giving vaccines to co-morbid groups must still be carried out by following the technical instructions for implementing the Covid-19 vaccine.

Amendments to the 1945 Constitution resulted in changes to state institutions. This is due to changes in the provisions governing state institutions. Some fundamental principles that determine relations between state institutions include the Supremacy of the Constitution, the Presidential System, and the Separation of Powers and Checks and Balances. Based on the description of the discussion in this article, it is concluded that the relationship between state institutions in Indonesia includes: (1) Relations between State Institutions in the Field of Government; (2) Relations Between State Institutions in the field of Legislation; (3) Relations Between State Institutions in the Judicial Sector, namely; (a) Relations between the Supreme Court and the Constitutional Court; (b) Relations between the Supreme Court and the President; (c) Relations between the Supreme Court and the House of Representatives.