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The perfect tense is used to describe a SINGLE COMPLETED ACTION in the past. For example, 'I did this ' or 'I have been to the shops.'

Phagocytosis is the process in which White Blood cells, such as neutrophils, engulf pathogens e.g. bacteria.

The gradient of the perpendicular line is the negative reciprocal of the gradient of the original line. For example if the gradient of the original line is 4, the gradient of the perpendicular line is -1/...

Zimbardo set up a mock prison and randomly assigned the roles of guards or prisoners to 24 male students, who were deemed emotionally stabled after extensive psychological testing. To increase the realism...

Pythagoras' Theorem can only be used on right angle triangles. To find the length of side a, the theorem can be used as follows:
a²=h²-b²
Taking the square root ...