Can be both. There are plenty of unicellular algae, such as Euglena, but most plants you see underwater are algae too (as long as they don't have flowers; a water lily is not an alga), and these are obviously multicellular. :P Oh, by the way, the singular is alga. One alga, two algae. ^^
Nope, only green algae is single celled
yes
most algae in the world is single celled but there are a few algae that are multicellular
Yes. Refer to the related links for a Wikipedia article on Spirogyra.
==The Final Answer. . .== Eubacteria is a single celled organism, just like its [so called] twin, Archaebacteria.
one singled celled organism is an amoeba. usally single celled organisms are surrounded by water
Amoeba is a primitive single celled organism.
Algae can be single-celled or multicellular. An example of a unicellular algae is Valonia ventricosa.
The world's largest single-celled organism is the green algae Caulerpa.
most algae in the world is single celled but there are a few algae that are multicellular
Yes, a diatom is a single celled organism. They are a major group of algae and usually found in all water environments.
No; a single-celled organism is a unicellularoraganism I believe.
one singled celled organism is an amoeba. usally single celled organisms are surrounded by water to survive.
The mechanism by which one small, single-celled organism could ingest a smaller single-celled organism is phagocytosis. Phagocytosis is the process of ingesting particles of a cell.
Yes. Refer to the related links for a Wikipedia article on Spirogyra.
No, not quite. A bacterium is a single-celled organism, for sure, but not all single-celled organisms are bacteria.
A single-celled organism without an organized nucleus is a prokaryote.
A single-celled organism is said to be unicellular.
Yes, it a single celled organism.