- 01.Defencesagainstpathogens,thehumanimmunesystemandvaccination
- 0:0 免费01.Non-specificdefencesofthehum ...
- 0:0 免费02.Immunityandvaccination
- 0:0 免费03.Evaluatingtheglobaluseofvacc ...
- 0:0 免费04.Plantdefencesagainstdisease
- 0:0 免费05.Lightmicroscopyobservingandi ...
- 02.Aerobicandanaerobiccellularrespiration
- 0:0 免费01.Aerobiccellularrespirationin ...
- 0:0 免费02.Anaerobiccellularrespiration ...
- 0:0 免费03.Theeffectofdifferentsubstrat ...
- 0:0 免费04.Explainingtheeffectofdiffere ...
- 03.Maintainingbiodiversityandhumanimpacts
- 0:0 免费01.Transfersofbiomassbetweentro ...
- 0:0 免费02.Negativehumaninteractionswit ...
- 0:0 免费03.Examplesofhumaninteractionsw ...
- 0:0 免费04.Benefitsandchallengesofmaint ...
- 0:0 免费05.Factorsaffectinghumanfoodsec ...
- 04.Transportandexchangesurfacesinplants
- 0:0 免费01.Plantrootsareadaptedtoabsorb ...
- 0:0 免费02.Observingroothaircellsusinga ...
- 0:0 免费03.Transportsystemsinplantsxyle ...
- 0:0 免费04.Observingthestructureanddist ...
- 0:0 免费05.Transportsystemsinplantsphlo ...
- 0:0 免费06.Observingxylemandphloemusing ...
- 0:0 免费07.Theeffectoflightonwateruptak ...
- 0:0 免费08.Theeffectsofenvironmentalfac ...
- 0:0 免费09.Theimportanceofexchangesurfa ...
- 05.Hormonesandhumanreproduction
- 0:0 免费01.Hormonespuberty,themenstrual ...
- 0:0 免费02.Hormonalandnon-hormonalmetho ...
- 06.Plantgrowthanddevelopment
- 0:0 免费01.Auxins,phototropismandgravit ...
- 0:0 免费02.Theeffectoflightonthegrowtho ...
- 07.Coordinationandcontrolmaintainingaconstantinternalenvironment
- 0:0 免费01.Effectofosmosisandsugarconce ...
- 0:0 免费02.Effectofosmosisandsugarconce ...
- 0:0 免费03.Usingamicroscopetoobserveeff ...
- 0:0 免费04.Theimportanceofmaintainingco ...
- 0:0 免费05.Theimportanceofmaintainingco ...
- 0:0 免费06.Theroleoftheskininthermoregu ...
- 0:0 免费07.Controllingwaterbalancetheki ...
- 08.Photosynthesisfactorsaffectingtherate
- 0:0 免费01.Factorsaffectingtherateofpho ...
- 0:0 免费02.Theeffectoflightintensityonr ...
- 0:0 免费03.Theeffectoflightintensityonr ...
- 0:0 免费04.Theeffectoflightintensityonr ...
- 0:0 免费05.Theeffectoflightintensityonr ...
- 0:0 免费06.Theeffectoflightintensityonr ...
- 0:0 免费07.Theeffectoflightintensityonr ...
- 0:0 免费08.Lightintensityandtheinverses ...
- 0:0 免费09.Photosynthesisandlimitingfac ...
- 09.Medicinesandnewtreatmentsfordisease
- 0:0 免费01.Antibiotics
- 0:0 免费02.Theeffectofantimicrobialsubs ...
- 0:0 免费03.Theeffectofantimicrobialsubs ...
- 0:0 免费04.Developmentofnewmedicines
- 10.Variationandnaturalselectionatthegeneticlevel
- 0:0 免费01.Variationandgeneticmutations
- 0:0 免费02.Naturalselectionatthegenetic ...
- 0:0 免费03.Mutationsandevolutioninbacte ...
- 0:0 免费04.Sexualandasexualreproduction
- 11.Classificationinmodernbiology
- 0:0 免费01.Classifyingorganismsaseukary ...
- 0:0 免费02.Electronmicroscopy,andthesiz ...
- 0:0 免费03.Classificationintokingdomsan ...
- 0:0 免费04.Classificationandreclassific ...
- 12.Genetechnology
- 0:0 免费01.Geneticengineering
- 0:0 免费02.Genetictestingforhealthcare
- 0:0
免费03.Genetictestingforfamilyplann ...