Animal Phyla Features Animals are?multicellular,?eukaryotic?organisms They are?heterotrophs?and most have a?nervous system?that enables responses to the surrounding environment There are over?30 an...
Plant Phyla Features All plants belong to the?plant kingdom Within the plant kingdom are several?phyla?(singular?phylum) Some plant phyla are small E.g. the Glaucophytes contain only 70 species and...
Examples of Classification Biological classification involves putting organisms into?groups, or?taxa?(singular?taxon) The taxa form a?hierarchy A?hierarchical system?is one in which?larger groups c...
Binomial System The?diversity of life?on Earth is vast, and is known as?global biodiversity The extent of global biodiversity is such that scientists can only?estimate?the total number of species p...
Examples of Natural Selection Because evolution by?natural selection?generally happens over?millions of years,?it is difficult to see it taking place, and we often have to rely on evidence from the...
Overproduction of Offspring The?number of offspring, or young, produced in each breeding event?differs between species Some species produce?small numbers?of young, e.g. elephants usually give birth...
Variation Differences?exist between organisms of the same?species These differences are known as?variation Examples of variation include: Coat colour in mammals Body length in fish Flower colour in...
Evidence for Evolution: Fossils Fossils are the?preserved remains?of organisms, or the traces left by organisms, such as footprints, burrows and faeces These remains can be?preserved,?e.g. in?rocks...
Evolution Defined Species?do not stay the same over time; the species that we see around us today have developed over millions of years This process of species change is known as?evolution Evolutio...
