They may be holozoic, saprobic, or parasitic. These are divided into four major groups. (1) Amoeboid protozoa or sarcodines They are unicellular, jelly-like protozoa found in fresh or sea water and in moist soil. Their body lacks a periplast. Therefore, they may be naked or covered by a calcareous shell.

Historically protozoa were divided into four major groups: the ameba, the flagellates, the ciliates, and the sporozoa. The distinguishing features between the groups was based on motility (i.e., ameboid, flagella, cilia). The sporozoa were a heterogeneous group that produced spores during one stage of their life cycles and exhibited a 'gliding.

They have flagella. The parasitic forms cause diseases such as sleeping sickness. Example: Trypanosoma. (c) Ciliated protozoa: These are aquatic, actively proving organisms because of the presence of thousands of cilia. They have a cavity (gullet) that opens to the outside of the cell surface.

Define economics. Explain the concepts of scarcity and opportunity cost and how they relate to the definition of economics. Understand the three fundamental economic questions: What should be produced? How should goods and services be produced? For whom should goods and services be produced?

Biotic factors include plants, animals, and microbes; important a biotic factors include the amount of sunlight in the ecosystem, the amount of oxygen and nutrients dissolved in the water, proximity to land, depth, and temperature. Sunlight is one of the most important a biotic factors for marine ecosystems.

They tried to unite the different regions of the Germany in 1848. But it was oppressed by the combined forces of the monarchy and the military. Later Prussia took on the leadership for national unification. Its Chief Minister Otto von Bismarck, was the architect of this process. He carried out this with the help of the Prussian army and.

Thomas Hunt Morgan (September 25, 1866 – December 4, 1945) [2] was an American evolutionary biologist, geneticist, embryologist, and science author who won the Nobel Prize in Physiology or Medicine in 1933 for discoveries elucidating the role that the chromosome plays in heredity. [3]