Protists are one type of organism that fits this description. They are eukaryotic cells and while they are not all single celled, some of them are.
Yeast (the organism used to make bread rise) is a single celled fungus that is substantially larger than most bacteria.
protozoan
Technically, a virus is not considered to be alive, therefore is not an organism at all. A virus does not have a conventional membrane, unless, as with HIV, it takes some from a host cell in order to mask its presence to other cells.
grow larger populations more quickly
smaller organisms are less complex and therefor easier and faster to study and analyze.
It can be hard to remember all the facts in Biology. Yes, mushrooms are larger and more complex organisms than molds.
An oxygen-based metabolism provides more energy than an anaerobic metabolism, allowing for a larger volume-to-surface ratio of organisms. So organisms could grow larger, allowing their tissues to specialize in various ways, which means increasing complexity.
Technically, a virus is not considered to be alive, therefore is not an organism at all. A virus does not have a conventional membrane, unless, as with HIV, it takes some from a host cell in order to mask its presence to other cells.
The largest organic molecules are nucleic acids.
grow larger populations more quickly
smaller organisms are less complex and therefor easier and faster to study and analyze.
It can be hard to remember all the facts in Biology. Yes, mushrooms are larger and more complex organisms than molds.
Not at all. Bacteria may be the smallest free-living organisms, but there are lots of protozoans like amoeba, parameciums and so forth, that are far larger.
No. Organ systems only develop in larger, complex organisms. E.g. amoeba, a single celled organism, is small enough that all its needs can be obtained by the relevant organelles through diffusion. A dog, a large multi-cellular organisms, needs a system to deliver its requirements to the necessary tissues .
Giardia is a flagellated protozoan. These types of organisms also cause diseases like bacteria. They are eukaryotes instead of prokaryotes like bacteria. This means that they are larger and have organelles. Bacteria are the opposite.
means they're more complex than other organisms.
bacteria are organisms that face changes all the time. if the change wipes out all the bacteria and leaves only one, sexual reproduction is a bad survival technique even if it mutates. They can grow to larger Populations more quickly. Apex- T.F.
The role of raising atmospheric oxygen to so high a level that multicellular and complex organisms could evolve. Oxidative phosphorylation generates the energy through ATP that larger and more complex organisms need.
Certain bacteria and viruses carry their DNA in little rings rather than in chromosomes, so don't have a distinct nucleus like larger organisms.