Opal is a unique gemstone that often displays a beautiful play-of-color. Opal exhibits all colors and both light and dark base colors that reflect a rainbow-like display of multiple colors when viewed from different angles (play-of-color). On Mohs' scale of hardness, opal ranks 5.5 to 6.5.
Most protozoa are animal-like (heterotrophic) because their carbon and energy must be obtained by eating or absorbing organic compounds originating from other living organisms. As eukaryotes they have several organelles, including at least one nucleus that contains most of the cell's deoxyribonucleic acid.Source(s):ost protozoa are animal-like (heterotrophic) because their carbon and energy must be obtained by eating or absorbing organic compounds originating from other living organisms. As eukaryotes they have several organelles, including at least one nucleus that contains most of the cell's deoxyribonucleic acid. Source(s):
Some protozoa can also reproduce sexually. 3. Relatively few protozoa cause disease. 4. The vegetative, reproducing, feeding form of a protozoan is called a trophozoite. 5. Under certain conditions, some protozoa produce a protective form called a cyst.6. Components of protozoa that function as PAMPs include GPI-anchored proteins and mannose-rich glycans.ome protozoa can also reproduce sexually. 3. Relatively few protozoa cause disease. 4. The vegetative, reproducing, feeding form of a protozoan is called a trophozoite. 5. Under certain conditions, some protozoa produce a protective form called a cyst. 6.