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Combined Science: Biology

GCSE · Edexcel · foundation

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  3
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  7
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  4
Cycles within Ecosystems

Evidence of Evolution Flashcards

All 6 cards in this deck

How old are the Ardi, Lucy and Richard Leakey hominid fossils?: Ardi — 4.4 million years; Lucy — 3.2 million years; Leakey's fossils — 1.6 million years.
How did brain size and walking change in hominids from Ardi to Leakey's fossils?: Brain size increased and walking became fully upright (bipedal), with shorter arms relative to legs, in the more recent fossils.
In a diagram of rock layers, which layer contains the most recent fossils or tools?: The top layer — younger rock layers are towards the top and older layers lower down.
How was a stone tool made?: By hitting it with another stone / rock / flint (something hard) to knock flakes or chips off — called knapping.
How did stone tools change over time as humans evolved?: Older tools are basic, simple and barely worked; newer tools are more refined, more pointed and more specialised.
Give two ways scientists date stone tools.: Radiometric dating of the rocks they are found in, and comparing them with fossils of a known age found in the same layer.