Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..
ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..
The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..
Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, ..
