Uned 3
Maint poblogaeth ac ecosystemau
Population ecology: https://www.youtube.com/watch?v=PQ-CQ3CQE3g
Exponential growth: https://www.youtube.com/watch?v=c6pcRR5Uy6w
Human population size: https://www.youtube.com/watch?v=QShgk6FrlX0
Populations: https://www.youtube.com/watch?v=KFViSog6ZJw
Energy flow in ecosystems: https://www.youtube.com/watch?v=lnAKICtJIA4
Ecological succession: https://www.youtube.com/watch?v=V49IovRSJDs
Biogeochemical cycling: https://www.youtube.com/watch?v=09_sWPxQymA
Effaith dyn ar yr amglychedd
Speciation and extinction: https://www.youtube.com/watch?v=yJLRl2G41nQ
Fishing: https://www.youtube.com/watch?v=rkpnS8xllbs
Planetary boundaries: https://www.youtube.com/watch?v=RgqtrlixYR4
Planetary boundaries: https://www.youtube.com/watch?v=d4fdF8rq5h8
Homeostasis a’r aren
Positive and negative feedback loops: https://www.youtube.com/watch?v=CLv3SkF_Eag
Homeostatic loops: https://www.youtube.com/watch?v=jkioZCDHT_E
The urinary system: https://www.youtube.com/watch?v=H2VkW9L5QSU
Osmoregulation: https://www.youtube.com/watch?v=qfWx8msgHqM
Y system nerfol
The nervous system: https://www.youtube.com/watch?v=UabDiuTtU0M&t=609s
The neuron: https://www.youtube.com/watch?v=HZh0A-lWSmY
The action potential: https://www.youtube.com/watch?v=HYLyhXRp298&t=486s
The synapse: https://www.youtube.com/watch?v=L41TYxYUqqs