Answer and Explanation:
1. Volunteer Matcher is an effective platform for finding volunteer opportunities. This is because this platform allows users to have access to non-profit institutions around the world, making it easier for people who want to volunteer to find more appropriate institutions. In addition, these institutions usually contact the platform to arrange volunteers with the desired profile.
2. As you have not shown the institutions to which the question refers, I will respond in a personal way. I believe that Greenpeace is an institution that I would like to be a volunteer, because besides being available worldwide, Greenpeace works with a noble and very important cause, which is environmental preservation.
3. During my experience with these two platforms, I found SimplyHired to be easier to access and with greater availability of opportunities and institutions appropriate for me.
