IB DP Biology: HL復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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?...
IB DP Biology: HL復習筆記4.2.5 Climate Change: Greenhouse Effect
The Main Greenhouse Gases When?radiation from the sun?hits the earth, it is?radiated back?from the earth's surface as?long-wave radiation A?greenhouse gas?is a gas that?absorbs?this re-radiated rad...
IB DP Biology: HL復習筆記4.2.4 Carbon Cycle: Organic Matter
Formation of Peat Under normal conditions the tissues of dead organisms are completely broken down by decomposers known as?saprotrophs?and?detritivores These decomposers require specific conditions...
IB DP Biology: HL復習筆記4.2.3 Carbon Cycle: Methane
Methanogenesis Methane?(CH4) is a simple?hydrocarbon It is present as a?gas?in the atmosphere, and underground, and is the main component of?natural gas?fossil fuel Methane can be produced by the?n...
IB DP Biology: HL復習筆記4.2.2 Carbon Cycle: Carbon Dioxide in the Atmosphere
Respiration & Carbon Dioxide All living cells carry out some form of cellular?respiration, from bacteria, to plants, to animals Many organisms carry out?aerobic respiration Aerobic respiration ...
IB DP Biology: HL復習筆記4.2.1 Carbon Cycle: Carbon Dioxide
Carbon Fixation Carbon?is present in the?atmosphere?in the form of?carbon dioxide gas Carbon is taken out of the atmosphere by plants to be used in?photosynthesis Plants are?autotrophs Autotrophs u...
