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):
There are over 30 000 protozoan species but not all are parasites. Protozoa usually have flagella and thus can actively move. Protozoa are 10â100 Âµm long and can be seen microscopically.They usually consume food by surrounding it with their cell membrane.Some species sweep food into their mouth parts.here are over 30 000 protozoan species but not all are parasites. Protozoa usually have flagella and thus can actively move. Protozoa are 10â100 Âµm long and can be seen microscopically. They usually consume food by surrounding it with their cell membrane. Some species sweep food into their mouth parts.