IB DP Biology: HL复习笔记6.1.2 Villi & Absorption
Villi: Increasing the Surface Area The ileum (the second section of the small intestine) is adapted for absorption It is very long It has a highly folded surface It has millions of villi (singular...
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IB DP Biology: HL复习笔记6.1.1 Digestion
Introduction to Digestion The digestive system is an example of an organ system in which several organs work together to digest and absorb food Digestion is a process in which relatively large, ins...
IB DP Biology: HL复习笔记5.2.7 Skills: Classification & Cladistics
Dichotomous Keys For anyone who doesn't specialise in studying a particular group of organisms, it can be very difficult to identify, or ID, a species when working in the field Correctly identifyin...
IB DP Biology: HL复习笔记5.2.6 Reclassification
Cladistics & Reclassification The development of DNA sequencing technology means that classification can now be carried out on the basis of evolutionary relationship Organisms classified in thi...
IB DP Biology: HL复习笔记5.2.5 Cladistics
Clades The term clade can be defined as A group of organisms that have all descended from a common ancestor Cladistics is the branch of science in which scientists put organisms into clades It invo...
IB DP Biology: HL复习笔记5.2.4 Animal Phyla Features
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...
IB DP Biology: HL复习笔记5.2.3 Plant Phyla Features
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...
IB DP Biology: HL复习笔记5.2.2 Classifying Organisms
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...
IB DP Biology: HL复习笔记5.2.1 Classification System
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...
