CIE IGCSE Biology: 復(fù)習(xí)筆記：20.1.5 Sustainability Sustainable Use of Resources We use many resources from the Earth; some, such as food, water and wood, are?sustainable resources A sustaina...
CIE IGCSE Biology: 復(fù)習(xí)筆記：20.1.4 Other Pollution Plastic Pollution Plastics have a large negative impact on both land and water habitats due to their non-biodegradability In marine habita...
CIE IGCSE Biology: 復(fù)習(xí)筆記：20.1.3 Water Pollution Untreated Sewage & Excess Fertiliser Human activities have led to the pollution of land, water and air Pollution comes from a v...
CIE IGCSE Biology: 復(fù)習(xí)筆記：20.1.2 The Importance of Biodiversity Human Pressures on Other Species Biodiversity Is defined as the?number of different species?that live in a particular area Human a...
CIE IGCSE Biology: 復(fù)習(xí)筆記：20.1.1 Ensuring Food Supply Intensive Food Production Making food production more?intensive?means producing food more?efficiently?with a finite amount of land an...
CIE IGCSE Biology: 復(fù)習(xí)筆記：19.1.6 Populations Definition of Population A population is defined as a group of organisms of one species, living in the same area at the same time Other important def...
CIE IGCSE Biology: 復(fù)習(xí)筆記：19.1.5 Nutrient Cycles The Carbon Cycle Nutrients such as carbon and nitrogen are not endless resources There is a finite amount of each element on the planet an...
CIE IGCSE Biology: 復(fù)習(xí)筆記：19.1.4 Pyramids of Energy: Extended Pyramids of Energy: Extended In order for the energy to be passed on,?it has to be consumed (eaten) However?not all of the en...
CIE IGCSE Biology: 復(fù)習(xí)筆記：19.1.3 Pyramids of Number & Biomass Pyramids of Number A pyramid of numbers shows?how many organisms?we are talking about at each level of a food chain. The?...
