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Eutrophication occurs when excess nutrients, like nitrates and phosphates, enter a body of water. These excess nutrients cause an increase in plant and algal growth in the water, often leading to an algal...

To attain the two marks you have to say that the RER contains ribosomes and these synthesis proteins. Enzymes are specialised proteins.

Motor neurone - carry info from the central nervous system to the effector cells

Sensory neurones - carry info from sensory receptors to the CNS

relay neurones - carry signals from one part ...

Stem cells are undifferentiated cells that retain the ability to specialize. In animals/ mammals, they are found in the embryos and adult tissue and in plants they are found in the meristematic tissue in ...