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White blood cells can have different roles and are important for protecting the body against pathogens. They can inges t a pathogen and destroy it, some produce antitoxins which destroy the toxins produced b...

A giant macromolecular covalent structure with a high melting point and covalent intramolecular bonds between all atoms.

2x 3 - 4x + 5For integration we add 1 to the power, and divide by the new powerso: (2x 3+1 )/4 - (4x 1+1 )/2 +5x 0+1 =1/2 x 4 - 2x 2 + 5x

1st we note our three methods for solving 1st order differential equation: separating the x and y variables to both sides of the equation, and integrating both sides with respect to x. Recognising an exact d...

In the poem Book Ends by Tony Harrison, the speaker’s mother has just died and he is sitting with his father as they try to decide which words should appear on her gravestone. Harrison uses the conceit of bo...