tissue embedding The technique of placing cells or tissue in a supporting medium so that thin sections can be cut using a microtome. The medium can be paraffin wax (paraffin embedding) or plastics (plastic embedding) such as epoxy resins...
Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..
This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..
This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..
This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..
