A moneran is a one-celled organism that does not have a nucleus. Another name for monerans is bacteria. Viruses are the smallest living things. They are actually not even cells, but are included in the study of living things because once they are inside a cell they reproduce. This chapter reviews these three types of microscopic life and describes their activities.
Many fungi are harmful to humans, but some, such as yeast, are very helpful.
This chapter reviews the types of fungi, including yeast, mold, and mildew, and how they get their food. Life Sciences - Invertebrates Invertebrates are animals which have no backbones. Scientists classify invertebrates based on their structure. This section reviews some of the most well-known groups of invertebrates, including porifera, cnideria, mollusca, echinodermata, and arthropods. Life Sciences - Vertebrates Vertebrates are animals which have backbones.