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Protozoa are indeed helpful; they help keep the balance in an ecosystem. Wikipedia has a page on them: http://en.wikipedia.org/wiki/Protozoa Hope this is helpful to you : )
Yes, shower head filters are very helpful. They do indeed help avoid clogs created by calcium and other minerals.
The swans swimming on a lake were not a change, indeed almost everything you can think of was not a change. This is of course a consequence of asking a negatively phrased question - "what was not".If you want a useful answer, please take care to ask you question in a way that enables us to provide a helpful answer.
Ladybugs are indeed helpful to humans, because they eat aphids, and aphids are damaging to many plants that we humans like to grow.
Indeed.
Indeed.
indeed it does
Yes, you can indeed buy blueprints online to make a garden storage unit. They can be extremely helpful.
Indeed it does!
Indeed it will.
Father Marquette was helpful on his journey with Joliet by acting as their chaplain, providing spiritual guidance and support. He also used his knowledge of Native American languages to facilitate communication with the indigenous tribes they encountered and to establish peaceful relations. Additionally, Marquette documented their journey, which helped to provide valuable information about the geography and people of the region.
Indeed it does and if a rock hits you on the nose you could have a crooked nose and that would be a significant change.