Describes the basic characteristics of three of the major kinds of flatworms, including tapeworms, planarians, and flukes.

Describes flatworm characteristics, including their physical features, types, nervous system, respiration, digestive system, and reproductive system.

Provides information about the anatomy of the earthworm's digestive system and why the earthworm plays such an important role in soil health.

The anatomy of an earthworm is described and how it reproduces.

Information about mealworms, including types, habitat, physical characteristics, using them as pet food, raising them, whether they can be pests, their role in the life cycle of the darkling beetle, and a list of quick facts about them.

One way plants have been classified has been based on the number of cotyledons in the seeds. The differences between monocots and dicots are listed along with some helpful facts.

Genetic traits are described as homozygous or heterozygous based on allele similarity. Homozygosity and heterozygosity are explained in this resource. Includes a chart highlighting their differences and some examples that occur in humans.

Discusses the characteristics of and differences between nucleosides and nucleotides as well as the significance of each in medicine.

The importance of the carbon cycle, how it works, the sources of carbon, and the steps in the carbon cycle are explained here.

Explains what the lytic cycle of a virus is and the steps involved in the process.

Purines and pyrimidines are nucleotides. Their properties are described here and their differences are highlighted. Includes examples of each.

Explains the process of facilitated diffusion which allows selective movement of materials across the cellular membrane.

Endocytosis enables cells to absorb extracellular nutrients that are needed for their survival. In receptor-mediated endocytosis, a protein receptor on the cell membrane binds to a nutrient molecule and facilitates its absorption through...

Cell transport can be active or passive. The two forms are described here and their differences highlighted.

The uses of potassium as a human nutrient, a plant nutrient, and in different industries are described.

Fermentation of lactic acid occurs during anaerobic respiration. The two-step process is described here, how it takes place in human muscle cells, and industrial applications of lactic acid fermentation.

Mannitol salt agar is a medium used to grow bacterial cultures in a laboratory. Read here about its composition and how it works.

A stop codon is a nucleotide triplet in messenger RNA that signals the end of a protein during the translation process. Read about how this works, the different types of stop codons, and how a mutation can sometimes occur.

A start codon is a nucleotide triplet in a genetic sequence that occurs at the start of a protein's synthesis. Read about how this works and how a mutation can sometimes occur.

The characteristics of vertebrates and invertebrates are described here. Includes a list of examples for each group and a chart highlighting their differences.

Discusses what pollination is, the types, what happens during pollination, its importance in agriculture and horticulture, and the biotic and abiotic factors that facilitate pollination. Has some embedded ads.

Describes the characteristics of Archaea, Bacteria, and Eukarya, the three domains of life.

Explains what the haploid number is and how it differs from a diploid number.

This resource explains how the alternation of generations occurs in a plant's life cycle where sporophytes and gametophytes each play a role in plant reproduction.