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...
IB DP Biology: HL复习笔记5.1.5 Natural Selection Examples
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...
IB DP Biology: HL复习笔记5.1.4 Natural Selection
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...
IB DP Biology: HL复习笔记5.1.3 Variation
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...
IB DP Biology: HL复习笔记5.1.2 Evolution: Evidence
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...
IB DP Biology: HL复习笔记5.1.1 Evolution
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...
IB DP Biology: HL复习笔记4.2.8 Skills: Carbon Cycling & Climate Change
Drawing the Carbon Cycle The many processes by which carbon is transferred from one store to another are collectively known as the?carbon cycle During the carbon cycle, carbon is present in both?or...
IB DP Biology: HL复习笔记4.2.7 Climate Change: Causes
Industrialisation & Increased Carbon Dioxide Atmospheric carbon dioxide levels have?fluctuated throughout Earth's history?due to events such as volcanic eruptions and the weathering of limeston...
IB DP Biology: HL复习笔记4.2.6 Climate Change: Impact
Greenhouse Gases & Climate Patterns Greenhouse gases?absorb infrared radiation emitted by the earth, causing the atmosphere to warm Without greenhouse gases, the earth would be much colder The?...
