While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..
Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..
