yes
Yes.
which organisms have more than one lens in their eyes ?
This have concerned taxonomous (biologists focused on organisms classification) for many many years.Consider that you have to classify furniture, it's very easy to say if something is a chair, a bed, or a nightstand. Now consider that you have to classify great mammals, it's easy too: lions, leopards, tigers, etc.But in biology, we have to tender our knowledge with an evolutionary background, so, we have to say if lions are more related to leopards or are more related to tigers. Even with big organisms it is hard to set up this relationships.French poodle dogs are a different canine species than german sheperd dogs? No, they are all the same species, Canis lupus familiaris.Imagine now a microscopic level, where you have to establish relationships among bacteria. Bacteria are very small organisms, comparing structures may not be a clever way to approach this problem, hence, we compare genetic and physiological processes. It's very hard to classify in a "natural way" all the organisms, because not all of them are even similar, fungi and plants couldn't be more different! But we consider both as living things.
Yes
Yes
No, typically you cannot travel with more than 10,000 items in your luggage.
are made of more than one cell.
species has more organisms than a kingdom.
Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.
There are no non-living organisms, unless you mean dead organisms.
The invention of the microscope allowed scientists to observe the diversity of microscopic organisms, leading them to realize that there was a need for more than two kingdoms to classify all living things. This eventually led to the development of the five-kingdom classification system.
Scientists rely on molecular and genetic similarities to classify organisms because these similarities provide more accurate and precise information about evolutionary relationships between species. By comparing DNA sequences and molecular structures, scientists can determine the degree of relatedness between different organisms, leading to a more robust classification system based on evolutionary history.