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Biology paper 2 (ecologyT (abiotic factors (Moisture levels, light…

- - - - new patheogens
  - - - plants and algae release co2 through respiration
        
        The carbon is taken in by plants the enters animals who eat the plants and the animals who eat the plant eating animals
        
        animals release co2 through respiration
        
        animals die and microbes fed on their bodies
        
        these microbes also release co2 into the air
- - - - this is called meiosis and is used to produce gametes from sexual reproduction-each daughter cell has half the amount of chromosomes than the parent cell
        
        2 parents are required for this cell division and it creates genetic variation
  - - - offspring are genetically identical
  - - - within the chromosomes the dna is structured in a double helix
        
        a small strand of DNA is called a gene
        
        Genes code for a specific protein to be made and a protein is a long chain of molecules mad up of amino acids
  - - - the better adapted ones survive
        
        then they reproduce passing on their adaptations
- - - - stimulus-receptor-coordinator-effector-response
    - - nerve cells (neurons) never touch and there is a small gap between them called a synapse.A signl sent from one neurone to the next by a chemical transmitter these transmitters are then destroyed
  - - - This gland is known as the master gland and the hormones it secreates bring about other responses it is situated in the brain
      - fsh causes eggs to mature
      - lh stimulates egg release
    - - If blood sugar levels are to high insulin is released causing glucose to move from the blood to cells-the liver converts glucose into insoluble glycogen and is removed from the blood
      - Diabetes is were a persons blood sugar can rise to a dangerous level
        
        type 2
        
        can be controlled with diet and excersise
        
        type 1:
        
        can be controlled with insulin
      - If blood sugar levels fall below a certain level the pancrease begins to produce glycogen instead which is converted bsck into glucose and enters the blood stream
        
        The digestion of proteins