-qué causo la principal problema ecológico en Costa Rica entre 1963 y 1983 -cuando estableció costa rica un sistema de reservas naturales y parques nacionales? -cuál es la estrategia de Costa Rica para corregir el problema?

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Question 3(multiple choice worth 4 points) (02.04 lc) which best describes the function of chloroplast? allows certa molecules to enter and exit the cell makes food during photosynthesis detoxifies waste products o packages proteins into vesicles

Can someone i have no idea of how to do this.